In theory, theory and practice are the same. In practice, they are not.

If you want to make your children brilliant, tell them fairy tales. If you want to make them more brilliant, tell them more fairy tales.

As for the search for truth, I know from my own painful searching, with its many blind alleys, how hard it is to take a reliable step, be it ever so small, towards the understanding of that which is truly significant.

The only source of knowledge is experience.

This is a time, when there seems to be a particular need for friends of wisdom and truth to join together.

I am also convinced that one gains the purest joy from spirited things only when they are not tied in with earning one's livelihood.

But there is another reason for the high repute of mathematics: it is mathematics that offers the exact natural sciences a certain measure of security which, without mathematics, they could not attain.