The courage of all one really knows comes but late in life.

The moral earth, too, is round! The moral earth, too, has its antipodes! The antipodes, too, have their right to exist! There is still another world to be discovered--and more than one! Set sail, you philosophers!

We must be physicists in order to be creative since so far codes of values and ideals have been constructed in ignorance of physics or even in contradiction to physics.

Society tames the wolf into a dog. And man is the most domesticated animal of all.

Human life is inexplicable, and still without meaning: a fool may decide its fate.

Envy and jealousy are the private parts of the human soul. Perhaps the comparison can be extended.

The one seeks a midwife to deliver his thoughts, the other, someone to assist: thus a good conversation comes into being.