Solomon
Proverbs 28:11ESV·traditional attribution

A rich man is wise in his own eyes, but a poor man who has understanding will find him out.

Matthew Henry Presbyterian @wholebiblehenry

Note, 1. Those that are rich are apt to think themselves wise, because, whatever else they are ignorant of, they know how to get and save; and those that are purse-proud expect that all they say should be regarded as an oracle and a law, and that none should dare to contradict them, but every sheaf bow to theirs; this humour is fed by flatterers...

John Gill Reformed Baptist @doctorgill

The rich man is wise in his own conceit,.... Ascribing his getting riches to his great sagacity, wisdom, and prudence; and being flattered with it by dependents on him; but the poor that hath understanding searcheth him out: a man of good understanding, whether in things natural, civil, moral, or spiritual, though poor, as a man may be poor and yet a wise man; such...

Jamieson-Fausset-Brown Reformed @jfbcommentary

A poor but wise man can discover (and expose) the rich and self-conceited.