We also stated above (chapters 10–11) that the exaggerated desire to receive was removed entirely from the system of sanctity and placed in the system of the worlds of impurity, from which emerge [several things]: the bodies, what those bodies need to live, and anything that they acquire in this world. After a man reaches the age of thirteen, involvement in Torah and mitzvot help him acquire a sanctified soul, which is nourished from the system of holy worlds, in proportion to the sanctified soul that the person has achieved.