The most aggravating thing about the younger generation is that I no longer belong to it.

Nothing that I can do or say will change the structure of the universe. But maybe, by raising my voice, I can help the greatest of all causes — good will among men and peace on earth.

The really valuable method of thought to arrive at a logically coherent system is intuition.

Most mistakes in philosophy and logic occur because the human mind is apt to take the symbol for the reality.

But the creative principle resides in mathematics. In a certain sense, therefore, I hold true that pure thought can grasp reality, as the ancients dreamed.

The distinctions separating the social classes are false; in the last analysis they rest on force.

Go out as far as you can go and start from there