The bite of conscience, like the bite of a dog into a stone, is a stupidity.

Science and art have that in common that everyday things seem to them new and attractive.

Mathematics would certainly have not come into existence if one had known from the beginning that there was in nature no exactly straight line, no actual circle, no absolute magnitude.

Out of love, women become entirely what it is that they are in the imaginations of the men who love them.

I love those who do not first seek a reason beyond the stars for going down and being sacrifices, but sacrifice themselves to the earth, that the earth of the Superman may hereafter arrive.

All isolation is wrong so say the herd. And long didst thou belong to the herd.

God created woman. And boredom did indeed cease from that moment-but many other things ceased as well!