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

The view is often defended that sciences should be built up on clear and sharply defined basal concepts. In actual fact no science, not even the most exact, begins with such definitions. The true beginning of scientific activity consists rather in describing phenomena and then in proceeding to group, classify and correlate them.

A piece of creative writing, like a day-dream, is a continuation of, and a substitute for, what was once the play of childhood.

I cannot think of any need in childhood as strong as the need for a father's protection.

A string of reproaches against other people leads one to suspect the existence of a string of self-reproaches with the same content.

The psychoanalysis of neurotics has taught us to recognize the intimate connection between wetting the bed and the character trait of ambition.

Human life in common is only made possible when a majority comes together which is stronger than any separate individual and which remains united against all separate individuals. The power of this community is then set up as right in opposition to the power of the individual, which is condemned as brute force.