VIII. Man's First Ancestors

The two eyes developed when the soul began to associate the external light-impressions more intimately with its own life, and thus was lost the capacity of perception of the surrounding astral world. The soul became more and more a mirror of the outer world, the latter being reproduced within it as an image; and simultaneously with this the separation of the sexes appeared. On the one hand, the human body became capable of fecundation only by another human being, while on the other hand there developed in the body “soul-organs” (the nervous system), by which the sense-impressions of the outer world were reflected in the soul, thereby preparing the way for the mind, or thinking principle, in the human body.