“A scientist shouldn't be asked to judge the economic and moral value of his work. All we should ask the scientist to do is find the truth and then not keep it from anyone.”

“A scientist doesn't know all the answers. Nobody does, not even teachers. But a scientist keeps on trying to find the answers.”

“There are certain questions that scientists may not ask, or, more accurately, for some questions, there are certain answers that scientists must a priori preclude from consideration.”

“The scientist has in common with the artist only this: that he can find no better retreat from the world than his work and no stronger link with the world than his work.”

“Why does the universe go to all the bother of existing? Is the unified theory so compelling that it brings about its own existence? Or does it need a creator, and, if so, does he have any other effect on the universe? And who created him?....Up to now, most scientists have been too occupied with the development of new theories that describe what the universe is to ask the question why. On the other hand, the people whose business it is to ask why, the philosophers, have not been able to keep up with the advance of scientific theories....However, if we do discover a complete theory, it should in time be understandable in broad principle by everyone, not just a few scientists. Then we shall all, philosophers, scientists, and just ordinary people, be able to take part in the discussion of the question of why it is that we and the universe exist. If we find the answer to that, it would be the ultimate triumph of human reason--for then we would know the mind of God.”

“Ask a true scientist a very profound question on his science, and he will besilent. Ask a true religious person a very simple question on his religion, and he will be frenzied.”