Where the world ceases to be the scene of our personal hopes and wishes, where we face it as free beings admiring, asking and observing, there we enter the realm of Art and Science.

You imagine that I look back on my life's work with calm satisfaction. But from nearby it looks quite different. There is not a single concept of which I am convinced that it will stand firm, and I feel uncertain whether I am in general on the right track.

The idea of a personal God is quite alien to me and seems even naïve.

The only sure way to avoid making mistakes is to have no new ideas.

Nothing truly valuable can be achieved except by the unselfish cooperation of many individuals.

The most important decision we make is whether we believe we live in a friendly or hostile universe.

I want to know all God's thoughts.