We will never be able to solve the problems of tomorrow with the thinking of today

If I am right the Germans will say I was a German, and the French will say I was a Jew; If I am wrong the Germans will say I was a Jew and the French will say I was a German.

[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

Albert is a very poor student. He is mentally slow, unsociable and is always daydreaming. He is spoiling it for the rest of the class. It would be in the best interests of all if he were removed from school immediately.

For an idea that does not first seem insane, there is no hope.

When I think of the most able students I have encountered in my teaching - I mean those who have distinguished themselves not only by skill but by independence of thought - then I must confess that all have had a lively interest in epistemology.

The Universe is a friendly place.