We think in generalities, but we live in detail.

The future belongs to those who can rise above the confines of the earth.

Philosophy asks the simple question: What is it all about?

The vitality of thought is in adventure. Ideas won't keep. Something must be done about them. When the idea is new, its custodians have fervor, live for it, and if need be, die for it.

Civilization advances by extending the number of important operations which we can perform without thinking about them. Operations of thought are cavalry charges in a battle - they are limited in number, they require fresh horses, and must only be made at decisive moments.

It is a safe rule to apply that, when a mathematical or philosophical author writes with a misty profundity, he is talking nonsense.

No Roman ever died in contemplation over a geometrical diagram.