Demons do not exist any more than gods do, being only the products of the psychic activity of man.

A strong egoism is a protection against disease, but in the last resort we must begin to love in order that we may not fall ill, and must fall ill if, in consequence of frustration, we cannot love.

One day, in retrospect, the years of struggle will strike you as the most beautiful.

Flowers are restful to look at. They have neither emotions nor conflicts.

I was making frequent use of cocaine at that time ... I had been the first to recommend the use of cocaine, in 1885, and this recommendation had brought serious reproaches down on me.

There is a psychological technique which makes it possible to interpret dreams, and ... if that procedure is employed, every dream reveals itself as a psychical structure which has a meaning and which can be inserted at an assignable point in the mental activities of waking life.

A collection to which nothing can be added and from which nothing can be removed is, in fact, dead!