Intellectual growth should commence at birth and cease only at death.

A conviction akin to religious feeling of the rationality or intelligibility of the world lies behind all scientific work of a high order.

I believe the most important mission of the state is to protect the individual and make it possible for him to develop into a creative personality.

[Max Planck] was one of the finest people I have ever known... but he really didn't understand physics, [because] during the eclipse of 1919 he stayed up all night to see if it would confirm the bending of light by the gravitational field. If he had really understood [general relativity], he would have gone to bed the way I did

Unless the cause of peace based on law gathers behind it the force and zeal of a religion, it hardly can hope to succeed.

Strange is our situation here on Earth. Each of us comes for a short visit, not knowing why, yet sometimes seeming to divine a purpose. From the standpoint of daily life, however, there is one thing we do know: that man is here for the sake of other men - above all for those upon whose smiles and well-being our own happiness depends.

No amount of experimentation can ever prove me right; a single experiment can prove me wrong.