I never teach my pupils, I only attempt to provide the conditions in which they can learn.

Men marry women with the hope they will never change. Women marry men with the hope they will change. Invariably they are both disappointed.

The religious geniuses of all ages have been distinguished by this kind of religious feeling, which knows no dogma and no God conceived in man's image; so that there can be no church whose central teachings are based on it. Hence it is precisely among the heretics of every age that we find men who were filled with this highest kind of religious feeling and were in many cases regarded by their contemporaries as atheists, sometimes also as saints. Looked at in this light, men like Democritus, Francis of Assisi, and Spinoza are closely akin to one another.

It is my conviction that killing under the cloak of war is nothing but an act of murder.

A man should look for what is, and not for what he thinks should be.

There is a driving force more powerful than steam, electricity and nuclear power: the will.

Everyone must become their own person, however frightful that may be.