To what kind of things ([Greek: ousia]) shall we adapt it?

But that cannot be conceived; for there must first exist a certain substance or nature ([Greek: ousia]) of good, by obtaining which we shall have pleasure in the soul.

But since it is impossible that man's nature ([Greek: ousia]) can be altogether pure, being mixed (composed) of such materials, reason is applied, as far as it is possible, and reason endeavors to make human nature love purity.