Nicene and Post-Nicene Fathers, Vol. IV:
Writings in Connection with the Manichæan Controversy.: Chapter 33

Chapter 33.—Every Nature, as Nature, is Good.

36.  But the consideration we wish most to urge is the truth of the Catholic doctrine, if they can understand it, that God is the author of all natures.  I urged this before when I said, I join with you in your condemnation of destructiveness, of blindness, of dense muddiness, of terrific violence, of perishableness, of the ferocity of the princes, and so on; join with me in commending form, classification, arrangement, harmony, unity of structure, symmetry and correspondence of members, provision for vital breath and nourishment, wholesome adaptation, regulation and control by the mind, and the subjection of the bodies, and the assimilation and agreement of parts in the natures, both those inhabiting and those inhabited, and all the other things of the same kind.  From this, if they would only think honestly, they would p. 146 understand that it implies a mixture of good and evil, even in the region where they suppose evil to be alone and in perfection:  so that if the evils mentioned were taken away, the good things will remain, without anything to detract from the commendation given to them; whereas, if the good things are taken away, no nature is left.  From this every one sees, who can see, that every nature, as far as it is nature, is good; since in one and the same thing in which I found something to praise, and he found something to blame, if the good things are taken away, no nature will remain; but if the disagreeable things are taken away, the nature will remain unimpaired.  Take from waters their thickness and muddiness, and pure clear water remains; take from them the consistence of their parts, and no water will be left.  If then, after the evil is removed, the nature remains in a purer state, and does not remain at all when the good is taken away, it must be the good which makes the nature of the thing in which it is, while the evil is not nature, but contrary to nature.  Take from the winds their terribleness and excessive force, with which you find fault, you can conceive of winds as gentle and mild; take from them the similarity of their parts which gives them continuity of substance, and the unity essential to material existence, and no nature remains to be conceived of.  It would be tedious to go through all the cases; but all who consider the subject free from party spirit must see that in their list of natures the disagreeable things mentioned are additions to the nature; and when they are removed, the natures remain better than before.  This shows that the natures, as far as they are natures, are good; for when you take from them the good instead of the evil, no natures remain.  And attend, you who wish to arrive at a correct judgment, to what is said of the fierce prince himself.  If you take away his ferocity, see how many excellent things will remain; his material frame, the symmetry of the members on one side with those on the other, the unity of his form, the settled continuity of his parts, the orderly adjustment of the mind as ruling and animating, and the body as subject and animated.  The removal of these things, and of others I may have omitted to mention, will leave no nature remaining.