Past is dead Future is uncertain; Present is all you have, So eat, drink and live merry.

[Freud's] sense of reality is less clouded by wishful thinking than is the case with other people and [he combines] the qualities of critical judgment, earnestness and responsibility.

Those who believe that politics and religion do not mix, understand neither.

How can any educated person stay away from the Greeks? I have always been far more interested in them than in science.

Everything is determined, the beginning as well as the end, by forces over which we have no control. It is determined for the insect, as well as for the star. Human beings, vegetables, or cosmic dust, we all dance to a mysterious tune, intoned in the distance by an invisible piper.

I never think of the future. It comes soon enough. When visiting the U.S. from Germany for a winter academic stay.

I have always loved solitude, a trait which tends to increase with age.