The most important experiences a man can have are those that take him to the very limit; that is the only way we learn, because it requires all our courage.
Books that teach us to dance: There are writers who, by portraying the impossible as possible, and by speaking of morality and genius as if both were high-spirited freedom, as if man were rising up on tiptoe and simply had to dance out of inner pleasure.
Enlightenment is man's leaving his self-caused immaturity. Immaturity is the incapacity to use one's intelligence without the guidance of another. Such immaturity is self-caused if it is not caused by lack of intelligence, but by lack of determination and courage to use one's intelligence without being guided by another. Sapere Aude! Have the courage to use your own intelligence! is therefore the motto of the enlightenment.
A folkish state must therefore begin by raising marriage from the level of a continuous defilement of the race, and give it the consecration of an institution which is called upon to produce images of the Lord and not monstrosities halfway between man and ape.