You don't even live once.

Do not learn more than you absolutely need to get through life

Es genügt nicht keinen Gedanken zu haben, man muss auch fähig sein, diesen auszudrücken.

Newspapers have roughly the same relationship to life as fortune-tellers to metaphysics

The secret of the demagogue is to make himself as stupid as his audience so that they believe they are as clever as he

Psychoanalysis is the mental illness it purports to cure