The soul, when accustomed to superfluous things, acquires a strong habit of desiring things which are neither necessary for the preservation of the individual nor for that of the species. This desire is without limit, whilst those which are necessary are few in number and restricted within certain limits; but what is superfluous is without end.
The soul is subject to health and disease, just as is the body. The health and disease of both . . . undoubtedly depend upon beliefs and customs, which are peculiar to mankind.
In so far as the soul is a force residing in the body; it has therefore been said that the properties of the soul depend of the condition of the body.
The error of the ignorant goes so far as to say that God's power is insufficient, because he has given to this Universe the properties which they imagine cause these great evils, and which do not help all evil-disposed persons to obtain the evil which they seek, and to bring their evil souls to the aim of their desires, though these, as we have shown, are really without limit.