A theory is something nobody believes, except the person who made it. An experiment is something everybody believes, except the person who made it.

The more a country makes military weapons, the more insecure it becomes: if you have weapons, you become a target for attack.

Never let yourself be seduced by any problem, no matter how difficult.

In the temple of science are many mansions, and various indeed are they that dwell therein and the motives that have led them thither. Many take to science out of a joyful sense of superior intellectual power; science is their own special sport to which they look for vivid experience and the satisfaction of ambition; many others are to be found in the temple who have offered the products of their brains on this altar for purely utilitarian purposes.

Science has brought forth this danger, but the real problem is in the minds and hearts of men.

The history of scientific and technical discovery teaches us that the human race is poor in independent and creative imagination.

Inner freedom is an infrequent gift of nature and a worthy object for the individual.