Solomon
Proverbs 20:6ESV·traditional attribution
Many a man proclaims his own steadfast love, but a faithful man who can find?
Matthew Henry Presbyterian @wholebiblehenry
Note, 1. It is easy to find those that will pretend to be kind and liberal. Many a man will call himself a man of mercy, will boast what good he has done and what good he designs to do, or, at least, what an affection he has to well-doing.
John Gill Reformed Baptist @doctorgill
Most men will proclaim everyone his own goodness,.... As the Pharisee did, in Luk 18:11; and as the Pharisees in common did; who did all their works to be seen of men, and made clean the outside of the cup and platter; and were very careful to appear outwardly righteous to men, Mat 23:5.
Jamieson-Fausset-Brown Reformed @jfbcommentary
Boasters are unreliable. goodness--or, "kind disposition."