Man is a rope, tied between beast and overman - a rope over an abyss. What is great in man is that he is a bridge and not an end: what can be loved in man is that he is an overture and a going under.

My humanity is a constant self-overcoming.

I am not reinventing myself. I am going through the layers and revealing myself. I am on a journey, an adventure that's constantly changing shape.

Man's inhumanity to man is only surpassed by his cruelty to animals.

The great variability of all the external differences between the races of man, likewise indicates that they cannot be of much importance; for if important, they would long ago have been either fixed and preserved, or eliminated.

Man could no longer be regarded as the Lord of Creation, a being apart from the rest of nature. He was merely the representative of one among many Families of the order Primates in the class Mammalia.