Christianity is the religion of melancholy and hypochondria. Islam, on the other hand, promotes apathy, and Judaism instills its adherents with a certain choleric vehemence, the heathen Greeks may well be called happy optimists.

A flutist who is moved to tears by his own performance will soon make the listeners laugh because of the sounds that he produces.

A person who looks different all the time frightens me. Only one animal changes its skin: the snake.

Turning popular opinion upside down does not make an original.

It is not a matter of desire, but of coercion and duty.

There is one privilege we'll never lose; currently it's called nationality. It means that everyone was born somewhere, which is infact self-evident.

When we interpret nature, we refer phenomena that are rarely entirely unintelligible back to something that actually exists, but is equally unintelligible.