Orthodoxus. Well, then, the connection of these names with substance is owing to its accidents. For murder is not a substance, nor is any other evil; but the substance receives a cognate name from putting it into practice. For a man is not (spoken of as) murder, but by committing it he receives the derived name of murderer, without being himself murder; and, to speak concisely, no other evil is a substance; but by practising any evil, it can be called evil. Similarly consider, if you imagine anything else to be the cause of evil to men, that it too is evil by reason of its acting by them, and suggesting the committal of evil. For a man is evil in consequence of his actions. For he is said to be evil, because he is the doer of evil. Now what a man does, is not the man himself, but his activity, and it is from his actions that he receives the title of evil. For if we were to say that he is that which he does, and he commits murders, adulteries, and such-like, he will be all these. Now if he is these, then when they are produced he has an existence, but when they are not, he too ceases to be. Now these things are produced by men. Men then will be the authors of them, and the causes of their existing or not existing. But if each man is evil in consequence of what he practises, and what he practises has an origin, he also made a beginning in evil, and evil too had a beginning. Now if this is the case, no one is without a beginning in evil, nor are evil things without an origin.
Valentinian. Well, my friend, you seem to me to have argued sufficiently against the other side. For you appeared to draw right conclusions from the premises which we granted to the discussion. For truly if matter is without qualities, then God is the maker of qualities; and if evils are qualities, God will be the author of evils. But it seems to me false to say that matter is without qualities; for it cannot be said respecting any substance that it is without qualities. But indeed, in the very act of saying that it is without qualities, you declare that it has a quality, by describing the character of matter, which is a kind of quality. Therefore, if you please, begin the discussion from the beginning; for it seems to me that matter never began to have qualities. For such being the case, I assert, my friend, that evil arises from its emanation.
Orthodoxus. If matter were possessed of qualities from eternity, of what will God be the creator? For if we say substances, we speak of them as pre-existing; if, again, we say qualities, these too are declared to have an existence. Since, then, both substances and qualities exist, it seems to me superfluous to call God a creator. But answer me a question. In what way do you say that God was a creator? Was it by changing the existence of those substances into non-existence, or by changing the qualities while He preserved the substances?
Valentinian. I think that there was no change of the substances, but only of the qualities; and in respect to these we call God a creator. And just as if one might chance to say that a house was made of stones, it cannot be said of them that they do not still continue stones in substance, because they are called a house; for I affirm that the house is made by the quality of construction. So I think that God, while substance remained, produced a change of its qualifies, by reason of which I say that this world was made by God.
Orthodoxus. Do you think, too, that evil is among the qualities of substances?
Valentinian. I do.
Orthodoxus. And were these qualities in matter from the first, or had they a beginning?
Valentinian. I say that these qualities were eternally co-existent with matter.
Orthodoxus. But do you not say that God has made a change in the qualities?
Valentinian. I do say this.
Orthodoxus. For the better?
Valentinian. I think so.
Orthodoxus. If, then, evil is among the qualities of matter, and its qualities were changed by God for the better, the inquiry must be made whence evil arose. For either all of them, being evil, underwent a change for the better, or some of them being evil, and some not, the evil ones were not changed for the better; but the rest, as far as they were found superior, were changed by God for the sake of order.
Valentinian. That is the opinion I held from the beginning.
Orthodoxus. How, then, do you say it was that He left the qualities of evil as they were? Was it that He was able to do away with them, or that, though He wished to do so, He was unable? For if you say that He was able, but disinclined to do so, He must be the author of these things; because, while He had power to bring evil to an end, He allowed it to remain as it was, especially when He had begun to work upon matter. For if He had had nothing at all to do with matter, He would not have been the author of what He allowed to remain. But since He works upon a part of it, and leaves a part of it to itself, while He has power to change it for the better, I think He is the author of evil, since He left part of matter in its vileness. He wrought then for the ruin of a part; and, in this respect, it seems to me that this part was chiefly injured by His arranging it in matter, so that it became partaker of evil. For before matter was put in order, it was without the perception of evil; but now each of its parts has the capacity of perceiving evil. Now, take an example in the case of man. Previously to becoming a living creature, he was insensible to evil; but from the time when he is fashioned by God into the form of man, he gains the perception of approaching evil. So this act of God, which you say was done for the benefit of matter, is found to have happened to it rather for the worse. But if you say that God was not able to stop evil, does the impossibility result from His being naturally weak, or from His being overcome by fear, and in subjection to some more powerful being? See which of these you would like to attribute to the almighty and good God. But, again, answer me about matter. Is matter simple or compound? For if matter be simple and uniform, and the universe compound, and composed of different substances, it is impossible to say that it is made of matter, because compound things cannot be composed of one pure and simple ingredient. For composition indicates the mixture of several simple things. But if, on the other hand, you say that matter is compound, it has been entirely composed of simple elements, and they were once each separately simple, and by their composition matter was produced; for compound things derive their composition from simple things. So there was once a time when matter did not exist— that is to say, before the combination of the simple elements. But if there was once a time when matter did not exist, and there was never a time when what is uncreated did not exist, then matter is not uncreated. And from this it follows that there are many things which are uncreated. For if God were uncreated, and the simple elements of which matter was composed were uncreated, the number of the uncreated would be more than two. But to omit inquiring what are the simple elements, matter or form— for this would be followed by many absurdities— let me ask, do you think that nothing that exists is contrary to itself?
Valentinian. I do.
Orthodoxus. Yet water is contrary to fire, and darkness to light, and heat to cold, and moisture to dryness.
Valentinian. I think it is.
Orthodoxus. If, then, nothing that exists is contrary to itself, and these are contrary to one another, they will not be one and the same mat-ter— no, nor formed from one and the same matter. But, again, I wish to ask, do you think that the parts of a thing are not destructive of one another?
Valentinian. I do.
Orthodoxus. And that fire and water, and the rest likewise, are parts of matter?
Valentinian. I hold them to be so.
Orthodoxus. Why, then, do you not think that water is destructive of fire, and light of darkness, and so on with the rest? Valentinian. I do.
Source: Concerning Free Will (New Advent)