Physics without mathematics is meaningless.

I tried to contribute to the defeat of the Soviets. If I contributed 1%, it is 1% of something enormous.

If not for me, the H-bomb would have been developed in Russia first. In the U.S., we'd now be speaking Russian.

Really exotic methods of propulsion . . . will have to be devised to get there. How it will be done, I do not know. Whether it will be done, I am not quite certain. But I would bet it can be done.

I claim that relativity and the rest of modern physics is not complicated. It can be explained very simply. It is only unusual or, put another way, it is contrary to common sense.

It is often claimed that knowledge multiplies so rapidly that nobody can follow it. I believe this is incorrect. At least in science it is not true. The main purpose of science is simplicity and as we understand more things, everything is becoming simpler. This, of course, goes contrary to what everyone accepts.

I think that intellectuals who end up in hell will have to read page proofs and check indexes there.