Whole chapter discussed by Augustine of Hippo —
The Day of Trouble
For the choirmaster. A Psalm of David.
1May the LORD answer you in the day of trouble;
may the name of the God of Jacob protect you.
2May He send you help from the sanctuary
and sustain you from Zion.
3May He remember all your gifts
and look favorably on your burnt offerings.
Selah
4May He give you the desires of your heart
and make all your plans succeed.
5May we shout for joy at your victory
and raise a banner in the name of our God.
May the LORD grant all your petitions.
6Now I know that the LORD saves His anointed;
He answers him from His holy heaven
with the saving power of His right hand.
7Some trust in chariots and others in horses,
but we trust in the name of the LORD our God.
8They collapse and fall,
but we rise up and stand firm.
9O LORD, save the king.
Answer us on the day we call.