The satisfaction of physical needs is indeed the indispensable pre-condition of a satisfactory existence, but in itself it is not enough. In order to be content, men must also have the possibility of developing their intellectual and artistic powers to whatever extent accords with their personal characteristics and abilities.

Politics is more difficult than physics.

Isn't it strange that I who have written only unpopular books should be such a popular fellow?

I have lived to prove Thoreau's contention that a man is rich in proportion to the number of things which he can afford to let alone.

I was originally supposed to become an engineer but the thought of having to expend my creative energy on things that make practical everyday life even more refined, with a loathsome capital gain as the goal, was unbearable to me.

A conviction akin to religious feeling of the rationality or intelligibility of the world lies behind all scientific work of a high order.

The field is the sole influence of the particle.