J. Robert Oppenheimer

There are children playing in the street who could solve some of my top problems in physics, because they have modes of sensory perception that I lost long ago.

I am become death, shatterer of worlds.

Today, it is not only that our kings do not know mathematics, but our philosophers do not know mathematics and -- to go a step further -- our mathematicians do not know mathematics.

Any man whose errors take ten years to correct is quite a man.

You can certainly destroy enough of humanity so that only the greatest act of faith can persuade you that what's left will be human.

The optimist thinks that this is the best of all possible worlds, and the pessimist knows it.