It takes an extraordinary intelligence to contemplate the obvious.

Simple solutions seldom are. It takes a very unusual mind to undertake analysis of the obvious.

Intelligence is quickness to apprehend as distinct form ability, which is capacity to act wisely on the thing apprehended.

In formal logic, a contradiction is the signal of defeat, but in the evolution of real knowledge it marks the first step in progress toward a victory

Civilizations can only be understood by those who are civilized.

If a dog jumps into your lap, it is because he is fond of you; but if a cat does the same thing, it is because your lap is warmer.