Only the real, rare, true scientific minds can endure doubt, which is attached to all our knowledge.

Not to know the past is to be in bondage to it, while to remember, to know, is to be set free.

The mind is like an iceberg, it floats with one-seventh of its bulk above water.

One becomes gradually accustomed to a new realization of the nature of 'happiness': one has to assume happiness when Fate does not carry out all its threats simultaneously.

Psychoanalysis is in essence a cure through love.

The act of birth is the first experience of anxiety, and thus the source and prototype of the affect of anxiety.

No other technique for the conduct of life attaches the individual so firmly to reality as laying emphasis on work; for his work at least gives him a secure place in a portion of reality, in the human community.