Where the world ceases to be the scene of our personal hopes and wishes, where we face it as free beings admiring, asking and observing, there we enter the realm of Art and Science.

Unlimited competition leads to a huge waste of labor, and to that crippling of the social consciousness of individuals.

The idea of a personal God is an anthropological concept which I am unable to take seriously.

Love is a better teacher than duty.

Science can only ascertain what is, but not what should be, and outside of its domain value judgements of all kinds remain necessary.

Failure is only postponed success as long as courage 'coaches' ambition.

It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure.