Memory is deceptive because it is colored by today's events.

There are two different conceptions about the nature of the universe: (1) the world as a unity dependent on humanity; (2) the world as a reality independent of the human factor.

The horizon of many people is a circle with a radius of zero. They call this their point of view.

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

It is the theory that decides what can be observed.

You can never solve a problem on the level on which it was created.

The supreme task of the physicist is to arrive at those universal elementary laws from which the cosmos can be built up by pure deduction. There is no logical path to these laws; only intuition, resting on sympathetic understanding of experience, can reach them.