Man has, as it were, become a kind of prosthetic God. When he puts on all his auxiliary organs, he is truly magnificent; but those organs have not grown on him and they still give him much trouble at times.

Thinking is an experimental dealing with small quantities of energy, just as a general moves miniature figures over a map before setting his troops in action.

A lady once expressed herself in society - the very words show that they were uttered with fervour and under the pressure of a great many secret emotions: "Yes, a woman must be pretty if she is to please the men. A man is much better off. As long as he has five straight limbs, he needs no more!"

all the categories which we employ to describe conscious mental acts, such as ideas, purposes, resolutions, and so on, can be applied tothese latent states.

Nature delights in making use of the same forms in the most various biological connections: as it does, for instance, in the appearance of branch-like structures both in coral and in plants, and indeed in some forms of crystal and in certain chemical precipitates.

Love can not be much younger than the lust for murder.

A man like me cannot live without a hobby-horse, a consuming passion - in Schiller's words a tyrant. I have found my tyrant, and in his service I know no limits. My tyrant is psychology. It has always been my distant, beckoning goal and now since I have hit upon the neuroses, it has come so much the nearer.