"On all earth, living creatures rend one another, and feast with unutterable cruelty on their kith and kin. No worm-mind can control a bestial man-body when it yearns to raven. Only man-minds instinctively conditioned through the course of ten thousand generations can keep the human instincts in thrall. Your body will destroy itself on earth, seeking the blood of its animal kin, seeking the cool water where it can wallow at its ease. Seeking eventually destruction, for the death-instinct is more powerful in it than the instincts of life and it will destroy itself in seeking to return to the slime from which it sprang."