During the youthful period of mankind's spiritual evolution human fantasy created gods in man's own image, who, by the operations of their will were supposed to determine, or at any rate to influence, the phenomenal world. Man sought to alter the disposition of these gods in his own favour by means of magic and prayer.

If tomorrow were never to come, it would not be worth living today.

Life is like a bicycle; keep moving on to maintain balance.

A country cannot simultaneously prepare and prevent war. I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones. The distinctions separating the social classes are false; in the last analysis they rest on force.

It is the theory which decides what we can observe

To understand the world one must not be worrying about one's self.

For an idea which, at first, does not seem absurd, there is no hope.