Exhortation to the Greeks; The Instructor; Stromata

Those, then, that adhere to impious words, and dictate them to others, inasmuch as they do not make a right but a perverse use of the divine words, neither themselves enter into the kingdom of heaven, nor permit those whom they have deluded to attain the truth. But not having the key of entrance, but a false (and as the common phrase expresses it), a counterfeit key (antikleis), by which they do not enter in as we enter in, through the tradition of the Lord, by drawing aside the curtain; but bursting through the side-door, and digging clandestinely through the wall of the Church, and stepping over the truth, they constitute themselves the Mystagogues¹ of the soul of the impious.

For that the human assemblies which they held were posterior to the Catholic Church² requires not many words to show.

For the teaching of our Lord at His advent, beginning with Augustus and Tiberius, was completed in the middle of the times of Tiberius.³

And that of the apostles, embracing the ministry of Paul, ends with Nero. It was later, in the times of Adrian the king, that those who invented the heresies arose; and they extended to the age of Antoninus the elder, as, for instance, Basilides, though he claims (as they boast) for his master, Glaucias, the interpreter of Peter.

Likewise they allege that Valentinus was a hearer of Theudas.⁴ And he was the pupil of Paul. For Marcion, who arose in the same age with them, lived as an old man with the younger⁵ [heretics]. And after him Simon heard for a little the preaching of Peter.

Such being the case, it is evident, from the high antiquity and perfect truth of the Church, that these later heresies, and those yet subsequent to them in time, were new inventions falsified [from the truth].

From what has been said, then, it is my opinion that the true Church, that which is really ancient, is one, and that in it those who according to God's purpose are just, are enrolled.⁶ For from the very reason that God is one, and the Lord one, that which is in the highest degree honourable is lauded in consequence of its singleness, being an imitation of the one first principle. In the nature of the One, then, is associated in a joint heritage the one Church, which they strive to cut asunder into many sects.

Therefore in substance and idea, in origin, in pre-eminence, we say that the ancient and Catholic⁷ Church is alone, collecting as it does into the unity of the one faith—which results from the peculiar Testaments, or rather the one Testament in different times by the will of the one God, through one Lord—those already ordained, whom God predestinated, knowing before the foundation of the world that they would be righteous.

But the pre-eminence of the Church, as the principle of union, is, in its oneness, in this surpassing all things else, and having nothing like or equal to itself. But of this afterwards.

Of the heresies, some receive their appellation from a [person's] name, as that which is called after Valentinus, and that after Marcion, and that after Basilides, although they boast of adducing the opinion of Matthew [without truth]; for as the teaching, so also the tradition of the apostles was one. Some take their designation from a place, as the Peratici; some from a nation, as the [heresy] of the Phrygians; some from an action, as that of the Encratites; and some from peculiar dogmas, as that of the Docetæ, and that of the Hærmatites; and some from suppositions, and from individuals they have honoured, as those called Cainists, and the Ophians; and some from nefarious practices and enormities, as those of the Simonians called Entychites.

After showing a little peep-hole to those who love to contemplate the Church from the law of sacrifices respecting clean and unclean animals (inasmuch as thus the common Jews and the heretics are distinguished mystically from the divine Church), let us bring the discourse to a close.

For such of the sacrifices as part the hoof, and ruminate, the Scripture represents as clean and acceptable to God; since the just obtain access to the Father and to the Son by faith. For this is the stability of those who part the hoof, those who study the oracles of God night and day, and ruminate them in the soul's receptacle for instructions; which gnostic exercise the Law expresses under the figure of the rumination of the clean animal. But such as have neither the one nor the other of those qualities it separates as unclean.

Now those that ruminate, but do not part the hoof, indicate the majority of the Jews, who have indeed the oracles of God, but have not faith, and the step which, resting on the truth, conveys to the Father by the Son. Whence also this kind of cattle are apt to slip, not having a division in the foot, and not resting on the twofold support of faith. For "no man," it is said, "knoweth the Father, but he to whom the Son shall reveal Him."⁸

And again, those also are likewise unclean that part the hoof, but do not ruminate.⁹ For these point out the heretics, who indeed go upon the name of the Father and the Son, but are incapable of triturating and grinding down the clear declaration of the oracles, and who, besides, perform the works of righteousness coarsely and not with precision, if they perform them at all. To such the Lord says, "Why will ye call me Lord, Lord, and do not the things which I say?"¹⁰

"but as chaff which the wind drives away from the face of the earth,"¹¹ and as a drop from a vessel."¹²

These points, then, having been formerly thoroughly treated, and the department of ethics having been sketched summarily in a fragmentary way, as we promised; and having here and there interspersed the dogmas which are the germs¹³ of true knowledge, so that the discovery of the sacred traditions may not be easy to any one of the uninitiated, let us proceed to what we promised.

Now the Miscellanies are not like parts laid out, planted in regular order for the delight of the eye, but rather like an umbrageous and shaggy hill, planted with laurel, and ivy, and apples, and olives, and figs; the planting being purposely a mixture of fruit-bearing and fruitless trees, since the composition aims at concealment, on account of those that have the daring to pilfer and steal the ripe fruits; from which, however, the husbandmen, transplanting shoots and plants, will adorn a beautiful park and a delightful grove.

The Miscellanies, then, study neither arrangement nor diction; since there are even cases in which the Greeks on purpose wish that ornate diction should be absent, and imperceptibly cast in the seed of dogmas, not according to the truth, rendering such as may read laborious and quick at discovery. For many and various are the baits for the various kinds of fishes.

And now, after this seventh Miscellany of ours, we shall give the account of what follows in order from another commencement.¹⁴

But the most ancient of the philosophers were not carried away to disputing and doubting, much less are we, who are attached to the really true philosophy, on whom the Scripture enjoins examination and investigation. For it is the more recent of the Hellenic philosophers who, by empty and futile love of fame, are led into useless babbling in refuting and wrangling. But, on the contrary, the Barbarian philosophy, expelling all contention, said, "Seek, and ye shall find; knock, and it shall be opened unto you; ask, and it shall be given you."¹⁵

Accordingly, by investigation, the point proposed for inquiry and answer knocks at the door of truth, according to what appears. And on an opening being made through the obstacle in the process of investigation, there results scientific contemplation. To those who thus knock, according to my view, the subject under investigation is opened.

And to those who thus ask questions, in the Scriptures, there is given from God (that at which they aim) the gift of the God-given knowledge, by way of comprehension, through the true illumination of logical investigation. For it is impossible to find, without having sought; or to have sought, without having examined; or to have examined, without having unfolded and opened up the question by interrogation, to produce distinctness; or again, to have gone through the whole investigation, without thereafter receiving as the prize the knowledge of the point in question.

But it belongs to him who has sought, to find; and to him to seek, who thinks previously that he does not know. Hence drawn by desire to the discovery of what is good, he seeks thoughtfully, without love of strife or glory, asking, answering, and besides considering the statements made. For it is incumbent, in applying ourselves not only to the divine Scriptures, but also to common notions, to institute investigations, the discovery ceasing at some useful end.

For another place and crowd await turbulent people, and forensic sophistries. But it is suitable for him, who is at once a lover and disciple of the truth, to be pacific even in investigations, advancing by scientific demonstration, without love of self, but with love of truth, to comprehensive knowledge.

What better or clearer method, for the commencement of instruction of this nature, can there be than discussion of the term advanced, so distinctly, that all who use the same language may follow it? Is the term for demonstration of such a kind as the word Blityri, which is a mere sound, signifying nothing? But how is it that neither does the philosopher, nor the orator,—no more does the judge,—adduce demonstration as a term that means nothing; nor is any of the contending parties ignorant of the fact, that the meaning does not exist?

Philosophers, in fact, present demonstration as having a substantial existence, one in one way, another in another. Therefore, if one would treat aright of each question, he cannot carry back the discourse to another more generally admitted fundamental principle than what is admitted to be signified by the term by all of the same nation and language.

Then, starting from this point, it is necessary to inquire if the proposition has this signification or not. And next, if it is demonstrated to have, it is necessary to investigate its nature accurately, of what kind it is, and whether it ever passes over the class assigned. And if it suffices not to say, absolutely, only that which one thinks (for one's opponent may equally allege, on the other side, what he likes); then what is stated must be confirmed. If the decision of it be carried back to what is likewise matter of dispute, and the decision of that likewise to another disputed point, it will go on ad infinitum, and will be incapable of demonstration. But if the belief of a point that is not admitted be carried back to one admitted by all, that is to be made the commencement of instruction. Every term, therefore, advanced for discussion is to be converted into an expression that is admitted by those that are parties in the discussion, to form the starting point for instruction, to lead the way to the discovery of the points under investigation. For example, let it be the term "sun" that is in question. Now the Stoics say that it is "an intellectual fire kindled from the waters of the sea." Is not the definition, consequently, obscurer than the term, requiring another demonstration to prove if it be true? It is therefore better to say, in the common and distinct form of speech, "that the brightest of the heavenly bodies is named the sun." For this expression is more credible and clearer, and is likewise admitted by all.

Similarly, also, all men will admit that demonstration is discourse,¹⁶ agreeable to reason, producing belief in points disputed, from points admitted.

Now, not only demonstration and belief and knowledge, but foreknowledge also, are used in a twofold manner. There is that which is scientific and certain, and that which is merely based on hope.

In strict propriety, then, that is called demonstration which produces in the souls of learners scientific belief. The other kind is that which merely leads to opinion. As also, both he that is really a man, possessing common judgment, and he that is savage and brutal,—each is a man. Thus also the Comic poet said that "man is graceful, so long as he is man." The same holds with ox, horse, and dog, according to the goodness or badness of the animal. For by looking to the perfection of the genus, we come to those meanings that are strictly proper. For instance, we conceive of a physician who is deficient in no element of the power of healing, and a Gnostic who is defective in no element of scientific knowledge.

Now demonstration differs from syllogism; inasmuch as the point demonstrated is indicative of one thing, being one and identical; as we say that to be with child is the proof of being no longer a virgin. But what is apprehended by syllogism, though one thing, follows from several; as, for example, not one but several proofs are adduced of Pytho having betrayed the Byzantines, if such was the fact. And to draw a conclusion from what is admitted is to syllogize; while to draw a conclusion from what is true is to demonstrate.

So that there is a compound advantage of demonstration: from its assuming, for the proof of points in question, true premisses, and from its drawing the conclusion that follows from them. If the first have no existence, but the second follow from the first, one has not demonstrated, but syllogized. For, to draw the proper conclusion from the premisses, is merely to syllogize. But to have also each of the premisses true, is not merely to have syllogized, but also to have demonstrated.

And to conclude, as is evident from the word, is to bring to the conclusion. And in every train of reasoning, the point sought to be determined is the end, which is also called the conclusion. But no simple and primary statement is termed a syllogism, although true; but it is compounded of three such, at the least,—of two as premisses, and one as conclusion.

Now, either all things require demonstration, or some of them are self-evident. But if the first, by demanding the demonstration of each demonstration we shall go on ad infinitum; and so demonstration is subverted. But if the second, those things which are self-evident will become the starting points [and fundamental grounds] of demonstration.

In point of fact, the philosophers admit that the first principles of all things are indemonstrable. So that if there is demonstration at all, there is an absolute necessity that there be something that is self-evident, which is called primary and indemonstrable.

Consequently all demonstration is traced up to indemonstrable faith.¹⁷

It will also turn out that there are other starting points for demonstrations, after the source which takes its rise in faith,—the things which appear clearly to sensation and understanding. For the phenomena of sensation are simple, and incapable of being decompounded; but those of understanding are simple, rational, and primary. But those produced from them are compound, but no less clear and reliable, and having more to do with the reasoning faculty than the first. For therefore the peculiar native power of reason, which we all have by nature, deals with agreement and disagreement. If, then, any argument be found to be of such a kind, as from points already believed to be capable of producing belief in what is not yet believed, we shall aver that this is the very essence of demonstration.

Now it is affirmed that the nature of demonstration, as that of belief, is twofold: that which produces in the souls of the hearers persuasion merely, and that which produces knowledge.

If, then, one begins with the things which are evident to sensation and understanding, and then draw the proper conclusion, he truly demonstrates. But if [he begin] with things which are only probable and not primary, that is evident neither to sense nor understanding, and if he draw the right conclusion, he will syllogize indeed, but not produce a scientific demonstration; but if [he draw] not the right conclusion, he will not syllogize at all.

Now demonstration differs from analysis. For each one of the points demonstrated, is demonstrated by means of points that are demonstrated; those having been previously demonstrated by others; till we get back to those which are self-evident, or to those evident to sense and to understanding; which is called Analysis. But demonstration is, when the point in question reaches us through all the intermediate steps. The man, then, who practices demonstration, ought to give great attention to the truth, while he disregards the terms of the premisses, whether you call them axioms, or premisses, or assumptions. Similarly, also, special attention must be paid to what suppositions a conclusion is based on; while he may be quite careless as to whether one choose to term it a conclusive or syllogistic proposition.

For I assert that these two things must be attended to by the man who would demonstrate—to assume true premisses, and to draw from them the legitimate conclusion, which some also call "the inference," as being what is inferred from the premisses.

Now in each proposition respecting a question there must be different premisses, related, however, to the proposition laid down; and what is advanced must be reduced to definition. And this definition must be admitted by all. But when premisses irrelevant to the proposition to be established are assumed, it is impossible to arrive at any right result; the entire proposition—which is also called the question of its nature—being ignored.

In all questions, then, there is something which is previously known,—that which being self-evident is believed without demonstration; which must be made the starting point in their investigation, and the criterion of apparent results.

For every question is solved from pre-existing knowledge. And the knowledge pre-existing of each object of investigation is sometimes merely of the essence, while its functions are unknown (as of stones, and plants, and animals, of whose operations we are ignorant), or [the knowledge] of the properties, or powers, or (so to speak) of the qualities inherent in the objects. And sometimes we may know some one or more of those powers or properties,—as, for example, the desires and affections of the soul,—and be ignorant of the essence, and make it the object of investigation. But in many instances, our understanding having assumed all these, the question is, in which of the essences do they thus inhere; for it is after forming conceptions of both—that is, both of essence and operation—in our mind, that we proceed to the question. And there are also some objects, whose operations, along with their essences, we know, but are ignorant of their modifications.

Such, then, is the method of the discovery [of truth]. For we must begin with the knowledge of the questions to be discussed. For often the form of the expression deceives and confuses and disturbs the mind, so that it is not easy to discover to what class the thing is to be referred; as, for example, whether the foetus be an animal. For, having a conception of an animal and a foetus, we inquire if it be the case that the foetus is an animal; that is, if the substance which is in the foetal state possesses the power of motion, and of sensation besides. So that the inquiry is regarding functions and sensations in a substance previously known. Consequently the man who proposes the question is to be first asked, what he calls an animal. Especially is this to be done whenever we find the same term applied to various purposes; and we must examine whether what is signified by the term is disputed, or admitted by all. For were one to say that he calls whatever grows and is fed an animal, we shall have again to ask further, whether he considered plants to be animals; and then, after declaring himself to this effect, he must show what it is which is in the foetal state, and is nourished.

For Plato calls plants animals, as partaking of the third species of life alone, that of appetency.¹⁸ But Aristotle, while he thinks that plants are possessed of a life of vegetation and nutrition, does not consider it proper to call them animals; for that alone, which possesses the other life—that of sensation—he considers warrantable to be called an animal. The Stoics do not call the power of vegetation, life.

Now, on the man who proposes the question denying that plants are animals, we shall show that he affirms what contradicts himself. For, having defined the animal by the fact of its nourishment and growth, but having asserted that a plant is not an animal, it appears that he says nothing else than that what is nourished and grows is both an animal and not an animal.

Let him, then, say what he wants to learn. Is it whether what is in the womb grows and is nourished, or is it whether it possesses any sensation or movement by impulse? For, according to Plato, the plant is animate, and an animal; but, according to Aristotle, not an animal, for it wants sensation, but is animate. Therefore, according to him, an animal is an animate sentient being. But according to the Stoics, a plant is neither animate nor an animal; for an animal is an animate being. If, then, an animal is animate, and life is sentient nature, it is plain that what is animate is sentient. If, then, he who has put the question, being again interrogated if he still calls the animal in the foetal state an animal on account of its being nourished and growing, he has got his answer.

But were he to say that the question he asks is, whether the foetus is already sentient, or capable of moving itself in consequence of any impulse, the investigation of the matter becomes clear, the fallacy in the name no longer remaining. But if he do not reply to the interrogation, and will not say what he means, or in respect of what consideration it is that he applies the term "animal" in propounding the question, but bids us define it ourselves, let him be noted as disputatious.

But as there are two methods, one by question and answer, and the other the method of exposition, if he decline the former, let him listen to us, while we expound all that bears on the problem. Then when we have done, he may treat of each point in turn. But if he attempt to interrupt the investigation by putting questions, he plainly does not want to hear.

But if he choose to reply, let him first be asked, To what thing he applies the name, animal. And when he has answered this, let him be again asked, what, in his view, the foetus means, whether that which is in the womb, or things already formed and living; and again, if the foetus means the seed deposited, or if it is only when members and a shape are formed that the name of embryos is to be applied. And on his replying to this, it is proper that the point in hand be reasoned out to a conclusion, in due order, and taught.

But if he wishes us to speak without him answering, let him hear. Since you will not say in what sense you allege what you have propounded (for I would not have thus engaged in a discussion about meanings, but I would now have looked at the things themselves), know that you have done just as if you had propounded the question, Whether a dog were an animal? For I might have rightly said, Of what dog do you speak? For I shall speak of the land dog and the sea dog, and the constellation in heaven, and of Diogenes too, and all the other dogs in order. For I could not divine whether you inquire about all or about some one. What you shall do subsequently is to learn now, and say distinctly what it is that your question is about. Now if you are shuffling about names, it is plain to everybody that the name foetus is neither an animal nor a plant, but a name, and a sound, and a body, and a being, and anything and everything rather than an animal. And if it is this that you have propounded, you are answered.

But neither is that which is denoted by the name foetus an animal. But that is incorporeal, and may be called a thing and a notion, and everything rather than an animal. The nature of an animal is different. For it was clearly shown respecting the very point in question, I mean the nature of the embryo, of what sort it is. The question respecting the meanings expressed by the name animal is different.

I say, then, if you affirm that an animal is what has the power of sensation and of moving itself from appetency, that an animal is not simply what moves through appetency and is possessed of sensation. For it is also capable of sleeping, or, when the objects of sensation are not present, of not exercising the power of sensation. But the natural power of appetency or of sensation is the mark of an animal. For something of this nature is indicated by these things. First, if the foetus is not capable of sensation or motion from appetency; which is the point proposed for consideration. Another point is; if the foetus is capable of ever exercising the power of sensation or moving through appetency. In which sense no one makes it a question, since it is evident.

But the question was, whether the embryo is already an animal, or still a plant. And then the name animal was reduced to definition, for the sake of perspicuity. But having discovered that it is distinguished from what is not an animal by sensation and motion from appetency; we again separated this from its adjuncts; asserting that it was one thing for that to be such potentially, which is not yet possessed of the power of sensation and motion, but will some time be so, and another thing to be already so actually; and in the case of such, it is one thing to exert its powers, another to be able to exert them, but to be at rest or asleep. And this is the question.

For the embryo is not to be called an animal from the fact that it is nourished; which is the allegation of those who turn aside from the essence of the question, and apply their minds to what happens otherwise. But in the case of all conclusions alleged to be found out, demonstration is applied in common, which is discourse (logos), establishing one thing from others. But the grounds from which the point in question is to be established, must be admitted and known by the learner. And the foundation of all these is what is evident to sense and to intellect.

Accordingly the primary demonstration is composed of all these. But the demonstration which, from points already demonstrated thereby, concludes some other point, is no less reliable than the former. It cannot be termed primary, because the conclusion is not drawn from primary principles as premisses.

The first species, then, of the different kinds of questions, which are three, has been exhibited—I mean that, in which the essence being known, some one of its powers or properties is unknown. The second variety of propositions was that in which we all know the powers and properties, but do not know the essence; as, for example, in what part of the body is the principal faculty of the soul.

Now the same treatment which applies to demonstration applies also to the following question.

Some, for instance, say that there cannot be several originating causes for one animal. It is impossible that there can be several homogeneous originating causes of an animal; but that there should be several heterogeneous, is not absurd.

Suppose the Pyrrhonian suspense of judgment, as they say, [the idea] that nothing is certain: it is plain that, beginning with itself, it first invalidates itself. It either grants that something is true, that you are not to suspend your judgment on all things; or it persists in saying that there is nothing true. And it is evident, that first it will not be true. For it either affirms what is true or it does not affirm what is true. But if it affirms what is true, it concedes, though unwillingly, that something is true. And if it does not affirm what is true, it leaves true what it wished to do away with. For, in so far as the scepticism which demolishes is proved false, in so far the positions which are being demolished, are proved true; like the dream which says that all dreams are false. For in confuting itself, it is confirmatory of the others.

And, in fine, if it is true, it will make a beginning with itself, and not be scepticism of anything else but of itself first. Then if [such a man] apprehends that he is a man, or that he is sceptical, it is evident that he is not sceptical.¹⁹ And how shall he reply to the interrogation? For he is evidently no sceptic in respect to this. Nay, he affirms even that he does doubt.

And if we must be persuaded to suspend our judgment in regard to everything, we shall first suspend our judgment in regard to our suspense of judgment itself, whether we are to credit it or not.

And if this position is true, that we do not know what is true, then absolutely nothing is allowed to be true by it. But if he will say that even this is questionable, whether we know what is true; by this very statement he grants that truth is knowable, in the very act of appearing to establish the doubt respecting it.

But if a philosophical sect is a leaning toward dogmas, or, according to some, a leaning to a number of dogmas which have consistency with one another and with phenomena, tending to a right life; and dogma is a logical conception, and conception is a state and assent of the mind: not merely sceptics, but every one who dogmatizes is accustomed in certain things to suspend his judgment, either through want of strength of mind, or want of clearness in the things, or equal force in the reasons.

The introductions and sources of questions are about these points and in them.

But before definitions, and demonstrations, and divisions, it must be propounded in what ways the question is stated; and equivocal terms are to be treated; and synomyms stated accurately according to their significations.

Then it is to be inquired whether the proposition belongs to those points, which are considered in relation to others, or is taken by itself. Further, If it is, what it is, what happens to it; or thus, also, if it is, what it is, why it is. And to the consideration of these points, the knowledge of Particulars and Universals, and the Antecedents and the Differences, and their divisions, contribute.

Now, Induction aims at generalization and definition; and the divisions are the species, and what a thing is, and the individual. The contemplation of the How adduces the assumption of what is peculiar; and doubts bring the particular differences and the demonstrations, and otherwise augment the speculation and its consequences; and the result of the whole is scientific knowledge and truth.

Again, the summation resulting from Division becomes Definition. For Definition is adopted before division and after: before, when it is admitted or stated; after, when it is demonstrated. And by Sensation the Universal is summed up from the Particular. For the starting point of Induction is Sensation; and the end is the Universal.

Induction, accordingly, shows not what a thing is, but that it is, or is not. Division shows what it is; and Definition similarly with Division teaches the essence and what a thing is, but not if it is; while Demonstration explains the three points, if it is, what it is, and why it is.

There are also Definitions which contain the Cause. And since it may be known when we see, when we see the Cause; and Causes are four—the matter, the moving power, the species, the end; Definition will be fourfold.

Accordingly we must first take the genus, in which are the points that are nearest those above; and after this the next difference. And the succession of differences, when cut and divided, completes the "What it is." There is no necessity for expressing all the differences of each thing, but those which form the species.

Geometrical analysis and synthesis are similar to logical division and definition; and by division we get back to what is simple and more elementary. We divide, therefore, the genus of what is proposed for consideration into the species contained in it; as, in the case of man, we divide animal, which is the genus, into the species that appear in it, the mortal, and the immortal. And thus, by continually dividing those genera that seem to be compound into the simpler species, we arrive at the point which is the subject of investigation, and which is incapable of further division.

For, after dividing "the animal" into mortal and immortal, then into terrestrial and aquatic; and the terrestrial again into those who fly and those who walk; and so dividing the species which is nearest to what is sought, which also contains what is sought, we arrive by division at the simplest species, which contains nothing else, but what is sought alone.

For again we divide that which walks into rational and irrational; and then selecting from the species, apprehended by division, those next to man, and combining them into one formula, we state the definition of a man, who is an animal, mortal, terrestrial, walking, rational.

Whence Division furnishes the class of matter, seeking for the definition the simplicity of the name; and the definition of the artisan and maker, by composition and construction, presents the knowledge of the thing as it is; not of those things of which we have general notions. To these notions we say that explanatory expressions belong. For to these notions, also, divisions are applicable.

Now one Division divides that which is divided into species, as a genus; and another into parts, as a whole; and another into accidents.

The division, then, of a whole into the parts, is, for the most part, conceived with reference to magnitude; that into the accidents can never be entirely explicated, if, necessarily, essence is inherent in each of the existences.

Whence both these divisions are to be rejected, and only the division of the genus into species is approved, by which both the identity that is in the genus is characterized, and the diversity which subsists in the specific differences.

The species is always contemplated in a part. On the other hand, however, if a thing is part of another, it will not be also a species. For the hand is a part of a man, but it is not a species. And the genus exists in the species. For [the genus] is both in man and the ox. But the whole is not in the parts. For the man is not in his feet. Wherefore also the species is more important than the part; and whatever things are predicated of the genus will be all predicated of the species.

It is best, then, to divide the genus into two, if not into three species. The species then being divided more generically, are characterized by sameness and difference. And then being divided, they are characterized by the points generically indicated.

For each of the species is either an essence; as when we say, Some substances are corporeal and some incorporeal; or how much, or what relation, or where, or when, or doing, or suffering.

One, therefore, will give the definition of whatever he possesses the knowledge of; as one can by no means be acquainted with that which he cannot embrace and define in speech. And in consequence of ignorance of the definition, the result is, that many disputes and deceptions arise. For if he that knows the thing has the knowledge of it in his mind, and can explain by words what he conceives; and if the explanation of the thought is definition; then he that knows the thing must of necessity be able also to give the definition.

Now in definitions, difference is assumed, which, in the definition, occupies the place of sign. The faculty of laughing, accordingly, being added to the definition of man, makes the whole—a rational, mortal, terrestrial, walking, laughing animal. For the things added by way of difference to the definition are the signs of the properties of things; but do not show the nature of the things themselves. Now they say that the difference is the assigning of what is peculiar; and as that which has the difference differs from all the rest, that which belongs to it alone, and is predicated conversely of the thing, must in definitions be assumed by the first genus as principal and fundamental.

Accordingly, in the larger definitions the number of the species that are discovered are in the ten Categories; and in the least, the principal points of the nearest species being taken, mark the essence and nature of the thing. But the least consists of three, the genus and two essentially necessary species. And this is done for the sake of brevity.

We say, then, Man is the laughing animal. And we must assume that which pre-eminently happens to what is defined, or its peculiar virtue, or its peculiar function, and the like.

Accordingly, while the definition is explanatory of the essence of the thing, it is incapable of accurately comprehending its nature. By means of the principal species, the definition makes an exposition of the essence, and almost has the essence in the quality.