A smart man only believes half of what he hears, a wise man knows which half.

A smart man makes a mistake, learns from it, and never makes that mistake again. But a wise man finds a smart man and learns from him how to avoid the mistake altogether.

The fool doth think he is wise, but the wise man knows himself a fool.

For the wise man looks into space and he knows there is no limited dimensions.

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

The only competition worthy of a wise man is with himself.