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.

Imagination without knowledge may create beautiful things, knowledge without imagination can create only perfect ones.

The most important human endeavor is the striving for morality in our actions.

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.

Every serious scientific worker is painfully conscious of this involuntary relegation to an ever-narrowing sphere of knowledge, which threatens to deprive the investigator of his broad horizon and degrades him to the level of a mechanic.

The greatest tragedy of human existence is the illusion of separateness.

It may be possible to fight intolerance, stupidity, and fanaticism seperately, but when they come together there is no hope.