Indeed, the great Leonardo (da Vinci) remained like a child for the whole of his life in more than one way. It is said that all great men are bound to retain some infantile part. Even as an adult he continued to play, and this was another reason why he often appeared uncanny and incomprehensible to his contemporaries.

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.

I should like to raise the question whether the inevitable stunting of the sense of smell as a result of man's turning away from the earth, and the organic repression of the smell-pleasure produced by it, does not largely share in his predisposition to nervous diseases.

Love and work are the cornerstones of our humanness.

It could be ventured to understand obsessive compulsive neurosis as the pathological counterpart of religious development, to define neurosis as an individual religiosity; to define religion as a universal obsessive compulsive neurosis.

There is no doubt that the resistance of the conscious and unconscious ego operates under the sway of the pleasure principle: it seeks to avoid the unpleasure which would be produced by the liberation of the repressed.

This is one race of people for whom psychoanalysis is of no use whatsoever.