Don't listen to the person who has the answers; listen to the person who has the questions.

It is impossible to solve significant problems using the same knowledge that created them.

It's no accident that capitalism has brought with it progress, not merely in production but also in knowledge. Egoism and competition are, alas, stronger forces than public spirit and sense of duty.

Formerly, people thought that if matter disappeared from the universe, space and time would remain. Relativity declares that space and time would disappear with matter.

The horizon of many people is a circle with a radius of zero. They call this their point of view.

I must be willing to give up what I am in order to become what I will be.

What separates me from most so-called atheists is a feeling of utter humility toward the unattainable secrets of the harmony of the cosmos.