A fool thinks himself to be wise, but a wise man knows himself to be a fool.

Wise men don't need advice. Fools won't take it.
Benjamin Franklin

Life's Tragedy is that we get old to soon and wise too late.
Benjamin Franklin

A fool thinks himself to be wise, but a wise man knows himself to be a fool.
William Shakespeare

The teacher who is indeed wise does not bid you to enter the house of his wisdom but rather leads you to the threshold of your mind.
Kahlil Gibran