Each makes this cosmos and its construction the pivot of his emotional life, in order to find in this way peace and security which he can not find in the narrow whirlpool of personal experience.

Imagination is the most powerful force in the universe.

Academic chairs are many, but wise and noble teachers are few; lecture-rooms are numerous and large, but the number of young people who genuinely thirst after truth and justice is small

The future is of greater interest to me than the past, since that is where I intend to spend the rest of my life.

One must shy away from questionable undertakings, even when they bear a high-sounding name.

Learning is experience. Everything else is just information.

My relationship to the Jewish people has become my strongest human bond, ever since I became fully aware of our precarious situation among the nations of the world.