The voice of the intellect is a soft one, but it does not rest until it has gained a hearing.

From error to error one discovers the entire truth.

I do not doubt that it would be easier for fate to take away your suffering than it would for me. But you will see for yourself that much has been gained if we succeed in turning your hysterical misery into common unhappiness.

Poets are masters of us ordinary men, in knowledge of the mind, because they drink at streams which we have not yet made accessible to science.

Religious illusion must bow to scientific truth. It is in total error about the nature of the true world. Only science is not an illusion.

There are no mistakes.

Religion (is) a universal obsessional neurosis.