Wise kings generally have wise counselors; and he must be a wise man himself who is capable of distinguishing one. Diogenes Wisdom
When I look upon seamen, men of science and philosophers, man is the wisest of all beings; when I look upon priests and prophets nothing is as contemptible as man. Diogenes Science
As a matter of self-preservation, a man needs good friends or ardent enemies, for the former instruct him and the latter take him to task. Diogenes Good
Those who have virtue always in their mouths, and neglect it in practice, are like a harp, which emits a sound pleasing to others, while itself is insensible of the music. Diogenes Music