I have lived to prove Thoreau's contention that a man is rich in proportion to the number of things which he can afford to let alone.

The school has always been the most important means of transferring the wealth of tradition from one generation to the next. This applies today in an even higher degree than in former times, for through modern development of economic life, the family

God is a scientist, not a magician.

If I had 20 days to solve a problem, I would take 19 days to define it

My opinion about Miller's experiments is the following. ... Should the positive result be confirmed, then the special theory of relativity and with it the general theory of relativity, in its current form, would be invalid. Experimentum summus judex. Only the equivalence of inertia and gravitation would remain, however, they would have to lead to a significantly different theory.

The mathematician knows some things, no doubt, but not those things one usually wants to get from him.

The led must not be compelled; they must be able to choose their own leader.