Each act is an island in time, to be judged on its own.

The pioneers of a warless world are the young men (and women) who refuse military service.

Everyone knew it was impossible, until a fool who didn't know came along and did it.

Thanks to my fortunate idea of introducing the relativity principle into physics, you (and others) now enormously overrate my scientific abilities, to the point where this makes me quite uncomfortable.

Nothing happens unless something moves.

The bigotry of the nonbeliever is for me nearly as funny as the bigotry of the believer.

Science will stagnate if it is made to serve practical goals.