Uncertainty in the pressure of vivid hopes and fears is painful, but must be endured if we wish to live without the support of comforting fairy tales.

All serious innovation is only rendered possible by some accident enabling unpopular persons to survive.

Hitler is an outcome of Rousseau.

Dora and I are now married, but just as happy as we were before.

Punctuality is a quality the need of which is bound up with social co-operation.

All knowledge, we feel, must be built up upon our instinctive beliefs; and if these are rejected, nothing is left.

Humanistic ethics is based on the principle that only humans themselves can determine the criterion for virtue and not an authority transcending us.