Faith, indeed, has up to the present not been able to move real mountains, although I do not know who assumed that it could. But it can put mountains where there are none.

Man, however, is the most courageous animal: thereby has he overcome every animal. With sound of triumph has he overcome every pain; human pain, however, is the sorest pain.

Men subsequently put whatever is newly learned or experienced to use as a plowshare, perhaps even as a weapon: but women immediately include it among their ornaments.

All idealism is falsehood in the face of necessity.

We must be physicists in order to be creative since so far codes of values and ideals have been constructed in ignorance of physics or even in contradiction to physics.

One who is unassuming in dealing with people exhibits his arrogance all the more strongly in dealing with things (city, state, society, age, mankind). That is his revenge.

Whatever a theologian regards as true must be false: there you have almost a criterion of truth.