In order to acquire intellect one must need it. One loses it when it is no longer necessary.

We should conserve evil just as we should conserve the forests. It is true that by thinning and clearing the forests the earth grew warmer.

Go through the towns and ask yourselves whether these people should reproduce! Let them go to their whores!

The tragedy is that we cannot believe the dogmas of religion and metaphysics if we have the strict methods of truth in heart and head, but on the other hand, we have become through the development of humanity so tenderly suffering that we need the highest kind of means of salvation and consolation: whence arises the danger that man may bleed to death through the truth that he realises.

The great advantage in noble parentage is that enables one to endure poverty more easily.

Your soul will be dead even before your body: fear nothing further.

Only individuals have a sense of responsibility.