There is only a finger's difference between a wise man and a fool. — Diogenes of Sinope

Between falsehood and useless truth there is little difference. As gold which he cannot spend will make no man rich, so knowledge which cannot apply will make no man wise. — Samuel Johnson
There is a difference between happiness and wisdom: he that thinks himself the happiest man is really so; but he that thinks himself the wisest is generally the greatest fool. — Francis Bacon
Does wisdom perhaps appear on the earth as a raven which is inspired by the smell of carrion? — Friedrich Nietzsche
Wise leaders generally have wise counselors because it takes a wise person themselves to distinguish them. — Diogenes of Sinope
In a rich man's house there is no place to spit but his face. — Diogenes of Sinope
Of what use is a philosopher who doesn't hurt anybody's feelings? — Diogenes of Sinope