Let every man judge according to his own standards, by what he has himself read, not by what others tell him.

What can the schools do to defend democracy? Should they preach a specific political doctrine? I believe they should not. If they are able to teach young people to have a critical mind and a socially oriented attitude, they will have done all that is necessary.

The minority, the ruling class at present, has the schools and press, usually the Church as well, under its thumb. This enables it to organize and sway the emotions of the masses, and make its tool of them.

Most people say that it is the intellect which makes a great scientist. They are wrong: it is character.

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.

Compound interest is the eighth wonder of the world. He who understands it, earns it ... he who doesn't ... pays it.

Politics is for the present, but an equation is for eternity.