The weather-cock on the church spire, though made of iron, would soon be broken by the storm-wind if it... did not understand the noble art of turning to every wind.
Ordinarily he was insane, but he had lucid moments when he was merely stupid.
Be entirely tolerant or not at all; follow the good path or the evil one. To stand at the crossroads requires more strength than you possess.
Where they have burned books, they will end in burning human beings.(Dort, wo man Bücher verbrennt, verbrennt man am Ende auch Menschen)
There are more fools in the world than there are people.
He only profits from praise who values criticism.
When books are burned in the end people will be burned too.