Mark 10:18

God, therefore, is uniquely good, and this he cannot lose. He is good. He is not good by sharing in any other good, because the good by which he is good is himself. But, when a finite human being is good, his goodness derives from God, because he cannot be his own good. All who become good do so through his Spirit. Our nature has been created to attain to him through acts of its own will. If we are to become good, it is important for us to receive and hold what he gives, who is good in himself.

They affirm, then, concerning the substance of the seed which is a cause of all existent things, that it is none of these, but that it produces and forms all things that are made, expressing themselves thus: "I become what I wish, and I am what I am: on account of this I say, that what puts all things in motion is itself unmoved. For what exists remains forming all things, and nought of existing things is made." He says that this (one) alone is good, and that what is spoken by the Saviour is declared concerning this (one): "Why do you say that am good? One is good, my Father which is in the heavens, who causeth His sun to rise upon the just and unjust, and sendeth rain upon saints and sinners." But who the saintly ones are on whom He sends the rain, and the sinners on whom the same sends the rain, this likewise we shall afterwards declare with the rest. And this is the great and secret and unknown mystery of the universe, concealed and revealed among the Egyptians. For Osiris, (the Naassene) says, is in temples in front of Isis; and his pudendum stands exposed, looking downwards, and crowned with all its own fruits of things that are made. And (he affirms) that such stands not only in the most hallowed temples chief of idols, but that also, for the information of all, it is as it were a light not set under a bushel, but upon a candlestick, proclaiming its message upon the housetops, in all byways, and all streets, and near the actual dwellings, placed in front as a certain appointed limit and termination of the dwelling, and that this is denominated the good (entity) by all. For they style this good-producing, not knowing what they say. And the Greeks, deriving this mystical (expression) from the Egyptians, preserve it until this day. For we behold, says (the Naassene), statues of Mercury, of such a figure honoured among them.

Marcion, adopting these sentiments, rejected altogether the generation of our Saviour. He considered it to be absurd that tinder the (category of a) creature fashioned by destructive Discord should have been the Logos that was an auxiliary to Friendship-that is, the Good Deity. (His doctrine,) however, was that, independent of birth, (the Logos) Himself descended from above in the fifteenth year of the reign of Tiberius Caesar, and that, as being intermediate between the good and bad Deity, He proceeded to give instruction in the synagogues. For if He is a Mediator, He has been, he says, liberated from the entire nature of the Evil Deity. Now, as he affirms, the Demiurge is evil, and his works. For this reason, he affirms, Jesus came down unbegotten, in order that He might be liberated from all (admixture of) evil. And He has, he says, been liberated from the nature of the Good One likewise, in order that He may be a Mediator, as Paul states, and as Himself acknowledges: "Why call ye me good? there is one good," These, then, are the opinions of Marcion, by means of which he made many his dupes, employing the conclusions of Empedocles. And he transferred the philosophy invented by that (ancient speculator) into his own system of thought, and (out of Empedocles) constructed his (own) impious heresy. But I consider that this has been sufficiently refuted by us, and that I have not omitted any opinion of those who purloin their opinions from the Greeks, and act despitefully towards the disciples of Christ, as if they had become teachers to them of these (tenets). But since it seems that we have sufficiently explained the doctrines of this (heretic), let us see what Carpocrates says.

There is no other secondary goodness existing in the Son than that which is in the Father. So the Savior himself rightly says in the Gospel that "none is good save one, God the Father." The purpose of this statement is to make it understood that the Son is not of some other ancillary "goodness," but of that alone which is in the Father; whose image he is rightly called. For he neither springs from any other source than from original goodness itself (if that were so, there would seem to be a different goodness in the Son from that which is in the Father), nor has the goodness that is in him any dissimilarity or divergence from that of the Father. Accordingly we ought not to imagine that there is some kind of blasphemy in the saying that "none is good save one, God the Father." These words are not to be taken as a denial that either Christ or the Holy Spirit is good. But, as we said before, the original goodness must be believed to reside in God the Father, and from him both the Son and Holy Spirit undoubtedly draw into themselves the nature of that goodness existing in the font from which the one is born and the other proceeds. If then there are any other things called good in the Scriptures such as an angel, or a man, or a servant, or a treasure, or a good heart, or a good tree, all these are so called by an inexact use of the word, since the goodness contained in them is accidental and not essential.

The good, then, is the same as the one who incomparably is. Over against good is evil or wickedness. Over against the one who incomparably is, is merely that which is not. So it follows that evil and corruption are, finally, that which becomes nothing. This, perhaps, is what has led some to affirm that the devil is not created by God. In respect that he is the devil he is not the work of God, but he who is the devil is a created being, and as a creature nonetheless remains a work of God, since there is nothing created that is not created by God. Think of it this way: A murderer is not a work of God insofar as he murders, while we may still say that insofar as he is a human being, God made him.