Chapter V.
Concerning the number of the Natures.
In the case, therefore, of the Godhead we confess that there is but one nature, but hold that there are three subsistences actually existing, anti hold that all things that are of nature and essence are simple, and recognise the difference of the subsistences only in the three properties of independence of cause and Fatherhood, of dependence on cause and Sonship, of dependence on cause and procession . And we know further that these are indivisible and inseparable from each other and united into one, and interpenetrating one another without confusion. Yea, I repeat, united without confusion, for they are three although united, and they are distinct, although inseparable. For although each has an independent existence, that is to say, is a perfect subsistence and has an individuality of its own, that is, has a special mode of existence, yet they are one in essence and in the natural properties. and in being inseparable and indivisible from the Father’s subsistence, and they both are and are said to be one God. In the very same way, then, in the case of the divine and ineffable dispensation , exceeding all thought and comprehension, I mean the Incarnation of the One God the Word of the Holy Trinity, and our Lord Jesus Christ, we confess that there are two natures, one divine and one human, joined together with one another and united in subsistence , so that one compound subsistence is formed out of the two natures: but we hold that the two natures are still preserved, even after the union, in the one compound subsistence, that is, in the one Christ, and that these exist in reality and have their natural properties; for they are united without confusion, and are distinguished and enumerated without being separable. And just as the three subsistences of the Holy Trinity are united without confusion, and are distinguished and enumerated without being separable , the enumeration not entailing division or separation or alienation or cleavage among them (for we recognise one God the Father, the Son and the Holy Spirit), so in the same way the natures of Christ also, although they are united, yet are united without confusion; and although they interpenetrate one another, yet they do not permit of change or transmutation of one into the other . For each keeps its own natural individuality strictly unchanged. And thus it is that they can be enumerated without the enumeration introducing division. For Christ, indeed, is one, perfect both in divinity and in humanity. For it is not the nature of number to cause separation or unity, but its nature is to indicate the quantity of what is enumerated, whether these are united or separated: for we have unity, for instance, when fifty stones compose a wall, but we have separation when the fifty stones lie on the ground; and again, we have unity when we speak of coal having two natures, namely, fire and wood, but we have separation in that the nature of fire is one thing, and the nature of wood another thing; for these things are united and separated not by number, but in another way. So, then, just as even though the three subsistences of the Godhead are united with each other, we cannot speak of them as one subsistence because we should confuse and do away with the difference between the subsistences, so also we cannot speak of the two natures of Christ as one nature, united though they are in subsistence, because we should then confuse and do away with and reduce to nothing the difference between the two natures.
Chapter. VI.
That in one of its subsistences the divine nature is united in its entirety to the human nature, in its entirety and not only part to part.
What is common and general is predicated of the included particulars. Essence, then, is common as being a form , while subsistence is particular. It is particular not as though it had part of the nature and had not the rest, but particular in a numerical sense, as being individual. For it is in number and not in nature that the difference between subsistences is said to lie. Essence, therefore, is predicated of subsistence, because in each subsistence of the same form the essence is perfect. Wherefore subsistences do not differ from each other in essence but in the accidents which indeed are the characteristic properties, but characteristic of subsistence and not of nature. For indeed they define subsistence as essence along with accidents. So that the subsistence contains both the general and the particular, and has an independent existence , while essence has not an independent existence but is contemplated in the subsistences. Accordingly when one of the subsistences suffers, the whole essence, being capable of suffering , is held to have suffered in one of its subsistences as much as the subsistence suffered, but it does not necessarily follow, however, that all the subsistences of the same class should suffer along with the suffering subsistence.
Thus, therefore, we confess that the nature of the Godhead is wholly and perfectly in each of its subsistences, wholly in the Father, wholly in the Son, and wholly in the Holy Spirit. Wherefore also the Father is perfect God, the Son is perfect God, and the Holy Spirit is perfect God. In like manner, too, in the Incarnation of the Trinity of the One God the Word of the Holy Trinity, we hold that in one of its subsistences the nature of the Godhead is wholly and perfectly united with the whole nature of humanity, and not part united to part . The divine Apostle in truth says that in Him dwelleth all the fulness of the Godhead bodily , that is to say in His flesh. And His divinely-inspired disciple, Dionysius, who had so deep a knowledge of things divine, said that the Godhead as a whole had fellowship with us in one of its own subsistences . But we shall not be driven to hold that all the subsistences of the Holy Godhead, to wit the three, are made one in subsistence with all the subsistences of humanity. For in no other respect did the Father and the Holy Spirit take part in the incarnation of God the Word than according to good will and pleasure But we hold that to the whole of human nature the whole essence of the Godhead was united. For God the Word omitted none of the things which He implanted in our nature when He formed us in the beginning, but took them all upon Himself, body and soul both intelligent and rational, and all their properties. For the creature that is devoid of one of these is not man. But He in His fulness took upon Himself me in my fulness, and was united whole to whole that He might in His grace bestow salvation on the whole man. For what has not been taken cannot be healed .
The Word of God , then, was united to flesh through the medium of mind which is intermediate between the purity of God and the grossness of flesh . For the mind holds sway over soul and body, but while the mind is the purest part of the soul God is that of the mind. And when it is allowed by that which is more excellent, the mind of Christ gives proof of its own authority , but it is under the dominion of and obedient to that which is more excellent, and does those things which the divine will purposes.
Further the mind has become the seat of the divinity united with it in subsistence, just as is evidently the case with the body too, not as an inmate , which is the impious error into which the heretics fall when they say that one bushel cannot contain two bushels, for they are judging what is immaterial by material standards. How indeed could Christ be called perfect God and perfect man, and be said to be of like essence with the Father and with us, if only part of the divine nature is joined in Him to part of the human nature ?
We hold, moreover, that our nature has been raised from the dead and has ascended to the heavens and taken its seat at the right hand of the Father: not that all the persons of men have risen from the dead and taken their seat at the right hand of the Father, but that this has happened to the whole of our nature in the subsistence of Christ . Verily the divine Apostle says, God hath raised us up together and made us sit together in Christ .
And this further we hold, that the union took place through common essences. For every essence is common to the subsistences contained in it, and there cannot be found a partial and particular nature, that is to say, essence: for otherwise we would have to hold that the same subsistences are at once the same and different in essence, and that the Holy Trinity in respect of the divinity is at once the same and different in essence. So then the same nature is to be observed in each of the subsistences, and when we said that the nature of the word became flesh, as did the blessed Athanasius and Cyrillus, we mean that the divinity was joined to the flesh. Hence we cannot say “The nature of the Word suffered;” for the divinity in it did not suffer, but we say that the human nature, not by any means, however, meaning all the subsistences of men, suffered in Christ, and we confess further that Christ suffered in His human nature. So that when we speak of the nature of the Word we mean the Word Himself. And the Word has both the general element of essence and the particular element of subsistence.