Like the physical, the psychical is not necessarily in reality what it appears to us to be.

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.

Religion (is) a universal obsessional neurosis.

The whole life of instinct serves the one end of bringing about death.

If there are quarrels between the parents or if their marriage is unhappy, the ground will be prepared in their children for the severest predisposition to a disturbance of sexual development or to neurotic illness.

You can always make a lot of people love one another so long as there are a smaller number outside the group for them to kick.

One is very crazy when in love.