The Apostle Paul
1 Corinthians 1:31BSB·traditional attribution

Therefore, as it is written: “Let him who boasts boast in the Lord.”

John Calvin Reformed @genevareformer

31. He that glorieth let him glory in the Lord Mark the end that God has in view in bestowing all things upon us in Christ — that we may not claim any merit to ourselves, but may give him all the praise.

Matthew Henry Presbyterian @wholebiblehenry

We have here, I. The manner in which Paul preached the gospel, and the cross of Christ: Not with the wisdom of words (Co1 1:17), the enticing words of man's wisdom (Co1 2:4), the flourish of oratory, or the accuracies of philosophical language, upon which the Greeks so much prided themselves, and which seem to have been the peculiar recommendations of some of the heads...

Commenting on 1 Corinthians 1:17-31

John Gill Reformed Baptist @doctorgill

That, according as it is written,.... Jer 9:23. He that glorieth, let him glory in the Lord; not in his own wisdom, riches, and strength; but in Christ, as his wisdom, righteousness, sanctification, and redemption. Next: 1 Corinthians Chapter 2