All rising curves that show unwelcome trends in human affairs will approach infinity if extended far enough, but it is we who dictate the curve and not vice versa.

If you think you understand it, that only shows that you don't know the first thing about it.

Never express yourself more clearly than you are able to think.

One must always do what one really cannot.

Our task is not to penetrate the essence of things, the meaning of which we do not know anyway, but rather to develop concepts which allow us to talk in a productive way about phenomena in nature

When it comes to atoms, language can be used only as in poetry.

Opposites are not contradictory but complementary.