Brevity is the soul of wit.

Somebody does somethin' stupid, that's human. They don't stop when they see it's wrong, that's a fool.

A fool's brain digests philosophy into folly, science into superstition, and art into pedantry. Hence University education.

The man who remains a fool even in advanced age is really a fool, just as the Indra-Varuna fruit does not become sweet no matter how ripe it might become.

To be idle is a short road to death and to be diligent is a way of life; foolish people are idle, wise people are diligent.

Do not keep company with a fool for as we can see he is a two-legged beast. Like an unseen thorn he pierces the heart with his sharp words.