Where they love they do not desire and where they desire they do not love.

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.

The poets and philosophers before me discovered the unconscious; what I discovered was the scientific method by which the unconscious can be studied.

The adoption of the required attitude of mind towards ideas that seem to emerge "of their own free will" and the abandonment of the critical function that is normally in operation against them seem to be hard of achievement for some people. The "involuntary thoughts" are liable to release a most violent resistance, which seeks to prevent their emergence. If we may trust that great poet and philosopher Friedrich Schiller, however, poetic creation must demand an exactly similar attitude.

The genitals themselves have not undergone the development of the rest of the human form in the direction of beauty.

Love and work, work and love...that's all there is.

Only a good-for-nothing is not interested in his past.