Berlin is the place to which I am most closely bound by human and scientific ties.

Anyone who thinks science is trying to make human life easier or more pleasant is utterly mistaken.

The only race I know is the human one.

It is not so important where one settles down. The best thing is to follow your instincts without too much reflection.

Truth is what stands the test of experience.

You are the only person I know who has the same attitude towards physics as I have: belief in the comprehension of reality through something basically simple and unified... It seems hard to sneak a look at God's cards. But that He plays dice and uses 'telepathic' methods... is something that I cannot believe for a single moment.

The leader is one who, out of the clutter, brings simplicity... out of discord, harmony... and out of difficulty, opportunity.