The more the fruits of knowledge become accessible to men, the more widespread is the decline of religious belief.

Crystals reveal their hidden structures only when broken.

The Irish are the one race for which psychoanalysis is of no use whatsoever... because they already live in a dream world.

Civilized people have exchanged some part of their chances of happiness for a measure of security.

Neither in my private life nor in my writings, have I ever made a secret of being an out-and-out unbeliever.

A collection to which nothing can be added and from which nothing can be removed is, in fact, dead!

By abolishing private property one deprives the human love of aggression.