The art of progress is to preserve order amid change, and to preserve change amid order. Life refuses to be embalmed alive.

The art of progress is to preserve order amid change and to preserve change amid order.

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.

It takes an extraordinary intelligence to contemplate the obvious.