There is a driving force more powerful than steam, electricity and nuclear power: the will.

By academic freedom I understand the right to search for truth and to publish and teach what one holds to be true. This right implies also a duty: one must not conceal any part of what on has recognized to be true. It is evident that any restriction on academic freedom acts in such a way as to hamper the dissemination of knowledge among the people and thereby impedes national judgment and action.

Raffiniert ist der Herr Gott, aber boshaft ist er nicht. God is subtle, but he is not malicious.

A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.

the scientist's religious feeling takes the form of a rapturous amazement at the harmony of natural law, which reveals an intelligence of such superiority that, compared with it, all the systematic thinking and acting of human beings is utterly insignificant reflection. This feeling is the guiding principle of his life and work, in so far as he succeeds in keeping himself from the shackles of selfish desire. It is beyond question closely akin to that which has possessed the religious geniuses of all ages.

Human beings, in their thinking, feeling and acting are not free agents but are as causally bound as the stars in their motion.

I believe in intuitions and inspirations...I sometimes FEEL that I am right. I do not KNOW that I am.