XI. Progressive Development Through The Different Cycles Of Culture

The human body thus became capable of taking in the Ego; for without red, warm blood a body cannot be the bearer of an Ego. This is very important. Pulmonary breathing is the first condition for the formation of warm, red blood. The required processes then arose upon the earth and became embodied with the blood. Little by little, man developed so as to become a red-blooded being breathing through lungs, and then he left behind the other creatures, the lower warm-blooded animals.