The human body is composed of millions of tiny different intelligences, each having its own specialized life, all having developed from a single generalized cell. Some cells die within hours, others within days or even longer after the body's own death.
The fertilized egg contains all the organs of the human being in miniature. They merely grow and become big to produce the adult.
-- Notebooks Category 26: World-Idea > Chapter 4 : True Idea of Man > # 195