David
Psalm 40:16ESV·traditional attribution

But may all who seek you rejoice and be glad in you; may those who love your salvation say continually, “Great is the LORD!”

John Calvin Reformed @genevareformer

PSALM 40 David, being delivered from some great danger, and it may be, not from one only, but from many, extols very highly the grace of God, and by means of this, his soul is filled with admiration of the providence of God, which extends itself to the whole human race.

Commenting on Psalm 40:1-17

C.H. Spurgeon Reformed Baptist @princeofpreachers

Let all those that seek thee, rejoice and be glad in thee. We have done with Ebal and turn to Gerizim. Here our Lord pronounces benedictions on his people. Note who the blessed objects of his petition are: not all men, but some men, "I pray for them, I pray not for the world." He pleads for seekers: the lowest in the kingdom, the babes...

Matthew Henry Presbyterian @wholebiblehenry

The psalmist, having meditated upon the work of redemption, and spoken of it in the person of the Messiah, now comes to make improvement of the doctrine of his mediation between us and God, and therefore speaks in his own person.

Commenting on Psalm 40:11-17