Tell me, my brother, what do we think bad, and worst of all? Is it not DEGENERATION?-And we always suspect degeneration when the bestowing soul is lacking.

Here the ways of men part: if you wish to strive for peace of soul and pleasure, then believe; if you wish to be a devotee of truth, then inquire.

All instincts that do not discharge themselves outwardly turn inward - this is what I call the internalization of man: thus it was that man first developed what was later called his soul.

A refined soul is distressed to know that someone owes it thanks; a crude soul, to know that it owes someone thanks.

Envy and jealousy are the private parts of the human soul. Perhaps the comparison can be extended.

The nobility of the soul makes itself known by admitting its egoism without consciousness, without remorse, without self-deception.