The successful revolutionary is a statesman, the unsuccessful one a criminal.

There is no meaning to life except the meaning man gives his life by the unfolding of his powers.

The ordinary man with extraordinary power is the chief danger for mankind - not the fiend or the sadist.

The mother-child relationship is paradoxical and, in a sense, tragic. It requires the most intense love on the mother's side, yet this very love must help the child grow away from the mother, and to become fully independent.

The capacity to be puzzled is the premise of all creation, be it in art or in science.