A person starts to live when he can live outside himself.

Too many of us look upon Americans as dollar chasers. This is a cruel libel, even if it is reiterated thoughtlessly by the Americans themselves.

The theory must not contradict empirical facts.

There are moments when one feels free from one's own identification with human limitations and inadequacies. At such moments one imagines that one stands on some spot of a small planet, gazing in amazement at the cold yet profoundly moving beauty of the eternal, the unfathomable; life and death flow into one, and there is neither evolution nor destiny; only Being.

It gives me great pleasure indeed to see the stubbornness of an incorrigible nonconformist warmly acclaimed.

This is too difficult for a mathematician. It takes a philosopher. The hardest thing in the world to understand is the income tax.

My life is a simple thing that would interest no one. It is a known fact that I was born, and that is all that is necessary.