Politics is a pendulum whose swings between anarchy and tyranny are fueled by perennially rejuvenated illusions.

For me the Jewish religion like all other religions is an incarnation of the most childish superstitions.

It is only men who are free, who create the inventions and intellectual works which to us moderns make life worth while.

Our task is to widen our circle of compassion to include all living beings and all of nature

Every one who is seriously involved in the pursuit of science becomes convinced that a spirit is manifest in the laws of the Universe-a spirit vastly superior to that of man, and one in the face of which we with our modest powers must feel humble.

We have penetrated far less deeply into the regularities obtaining within the realm of living things, but deeply enough nevertheless to sense at least the rule of fixed necessity... what is still lacking here is a grasp of the connections of profound generality, but not a knowledge of order itself.

Intelligence is not the ability to store information, but to know where to find it.