In the Trinity it is not possible to admit any disparity: but equality in every way to be predicated.
4. Your holiness sees how in this man's scheme, which is not reasoning but raving, the Trinity does not hold together and the Unity is rendered doubtful, and that this cannot be without injury to the Majesty. For whatever That is which is God, it is without doubt That than which nothing greater can be conceived. If, then, in this One and Supreme Majesty we have found anything that is insufficient or imperfect in our consideration of the Persons, or if we have found that what is assigned to one is taken from another, the whole is surely less than That, than which nothing greater can be conceived. For indubitably the greatest which is a whole is greater than that which consists of parts. That man thinks worthily, as far as man can, of the Divine Majesty who thinks of no inequality in It where the whole is supremely great; of no separation where the whole is one; of no chasm where the whole is undivided; in short, of no imperfection or deficiency where the whole is a whole. For the Father is a whole, as are the Father, the Son and the Holy Spirit; the Son is a whole, as are He Himself and the Father and the Holy Spirit; the Holy Spirit is a whole, as are He Himself and the Father and the Son. And the whole Unity is a whole neither superabounding in the Three, nor diminished in Each Person. For they do not individually divide between Them that real and highest Good which they are, since they do not possess It in the way of participation, but are essentially the very Good. For those phrases which we most rightly use, as One from Another, or One to Another, are designations of the Persons, not division of the Unity. For although in this ineffable and incomprehensible essence of the Deity we can; by the requirements of the properties of the Persons, say One and Another in a sober and Catholic sense, yet there is not in the essence One and Another, but simple Unity; nor in the confession of the Trinity any derogation to the Unity, nor is the true assertion of the Unity any exclusion of the propria of the Persons. May that execrable similitude of genus and species be accordingly as far from our minds as it is from the rule of truth. It is not a similitude, but a dissimilitude, as is also that of brass and the brazen seal; for since genus and species are to each other as higher and lower, while God is One, there can never be any resemblance between equality so perfect and disparity so great. And again, with regard to his illustration of brass, and the brass which is made into a seal, since it is used for the same kind of similitude, it is to be similarly condemned. For since, as I have said, species is less than and inferior to genus, far be it from us to think of such diversity between the Father and the Son. Far be it from us to agree with him who says that the Son is related to the Father as species to genus, as man to animal, as a brazen seal to brass, as force to force absolutely. For all these several things by the bond of their common nature are to each other as superiors and inferiors, and therefore no comparison is to be drawn from these things with That in which there is no inequality, no dissimilarity. You see from what unskilfulness or impiety the use of these similitudes descends.