My way of working was different years ago. I used to wait until an idea came to me. Now I go half-way to meet it, though I don't know whether I find it any the quicker.

We believe that civilization has been created under the pressure of the exigencies of life at the cost of satisfaction of the instincts.

Religion is an attempt to get control over the sensory world, in which we are placed, by means of the wish-world which we have developed inside us as a result of biological and psychological necessites.

He that has eyes to see and ears to hear may convince himself that no mortal can keep a secret. If his lips are silent, he chatters with his fingertips; betrayal oozes out of him at every pore.

No one who, like me, conjures up the most evil of those half-tamed demons that inhabit the human breast, and seeks to wrestle with them, can expect to come through the struggle unscathed.

The voice of the intellect is soft one, but it does not rest until it has gained a hearing. Ultimately, after endless rebuffs, it succeeds. This is one of the few points in which one may be optimistic about the future of mankind.

Desire presses ever forward unsubdued.