121. Of two children of the same parents and educated under the same conditions, why may one be intelligent and the other slow, one good and the other evil? Why is it that the child of aperson of genius is sometimes a dullardand thechildofa dullardaperson ofgenius?
This fact finds its support in the origin of innate ideas. Moreover, it shows that the soul of such a child in no way proceeds from the parents; otherwise, in virtue of the saying that the part is of the same nature as the whole, the parents would transmit their qualities and defects to their children, just as they transmit the principle of their corporeal qualities. In procreation, only the body proceeds from the body, whereas the souls are independent of one another.