John Gill Commentary Proverbs 28:11

"The rich man is wise in his own conceit; But the poor that hath understanding searcheth him out." — Proverbs 28:11 (ASV)

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 has understanding searches 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 an one, when he comes into company with a rich man, wise in his own conceit, he soon by conversation with him finds him out to be a very foolish man, and exposes him as one; for riches are not always to men of understanding, or all that have them are not such; and better is a poor wise man than even a foolish king; see (Ecclesiastes 9:11Ecclesiastes 9:15) (4:13) .