I have found little 'good' about human beings. In my experience, most of them are trash.

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.

Love is a state of temporary psychosis.

Do you not know how uncontrolled and unreliable the average human being is in all that concerns sexual life?

The primitive stages can always be re-established; the primitive mind is, in the fullest meaning of the word, imperishable.

In so doing, the idea forces itself upon him that religion is comparable to a childhood neurosis, and he is optimistic enough to suppose that mankind will surmount this neurotic phase, just as so many children grow out of their similar neurosis.

[The child receives impressions like] a photographic exposure that can be developed after any interval of time and transformed into a picture.