David
Psalm 138:1ESV·traditional attribution

I give you thanks, O LORD, with my whole heart; before the gods I sing your praise;

John Calvin Reformed @genevareformer

PSALM 138 In this Psalm David, in remembrance of the singular help which had always been vouchsafed him by God — the experience he had enjoyed of his faithfulness and goodness, takes occasion to stir himself up to gratitude; and from what he had known of the divine faithfulness, he anticipates a continuance of the same mercy. If dangers must be met, he confidently looks for a happy issue.

Commenting on Psalm 138:1-8

C.H. Spurgeon Reformed Baptist @princeofpreachers

I will praise thee with my whole heart. His mind is so taken up with God that he does not mention his name: to him there is no other God, and Jehovah is so perfectly realized and so intimately known, that the Psalmist, in addressing him, no more thinks of mentioning his name than we should do if we were speaking to a father or a friend.

Matthew Henry Presbyterian @wholebiblehenry

I. How he would praise God, compare Psa 111:1. 1. He will praise him with sincerity and zeal - "With my heart, with my whole heart, with that which is within me and with all that is within me, with uprightness of intention and fervency of affection, inward impressions agreeing with outward expressions." 2.

Commenting on Psalm 138:1-5