In science it is not enough to think of an important problem on which to work. It is also necessary to know the means which could be used to investigate the problem.

Do not destroy what you cannot create.

Don't lie if you don't have to.

When a scientist says something, his colleagues must ask themselves only whether it is true. When a politician says something, his colleagues must first of all ask, 'Why does he say it?

I'm all in favor of the democratic principle that one idiot is as good as one genius, but I draw the line when someone takes the next step and concludes that two idiots are better than one genius.

A great power imposes the obligation of exercising restraint, and we did not live up to this obligation. I think this affected many of the scientists in a subtle sense, and it diminished their desire to continue to work on the bomb.

If the thickness is larger than the critical value I can produce an explosion.