Lecture I
For we know that at birth man carries into the physical world what he has brought with him as the result of his former earthly lives. When he is born, his physical brain, for instance, is but a very imperfect instrument. The soul has to work a finer organization into that instrument, in order to make it the agent of everything that the soul is capable of performing. In point of fact, the human soul, before it is fully conscious, works upon the brain so as to make it an instrument for exercising all the abilities, aptitudes and qualities, which appertain to the soul as the result of its former earthly lives. This work on a man's own body is directed from points of view which are wiser than anything he can subsequently do for himself when in possession of full consciousness.
Cite:
GA 15/l01/p005 · edition ASGB1921