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the mode of union holds the principle of the difference preserved, therefore the voice of the saint is a periphrasis, signifying by an appropriate name for the double nature of Christ the double energy; since in no way is the essential principle of the united [natures] diminished by the union in nature and quality. But not as if for someone, by the denial of the extremes an affirmation of some middle is made. For there is not some middle in Christ, affirmed by the denial of the extremes. "New," indeed, as characteristic of a common mystery, whose principle is the ineffable mode (1057) of the connaturality. For who has known how God is enfleshed, and remains God? how, remaining true God, he is true man? showing himself to be truly both by natural existence, and the one through the other, and not being changed into either. These things faith alone comprehends, honoring the Word in silence, to whose nature no principle of beings is innate. And "theandric," not as simple, nor as some composite thing, and belonging either only to a bare divinity by nature, or only to a mere humanity, or pertaining to a composite nature in the middle of certain extremes, but most fitting to God who was made man, that is, who was perfectly incarnate. Nor again one, as if "the new" could not be understood otherwise, as it seemed to some, than "of one being able;" for "newness" is of quality, but not of quantity; since it will also by necessity introduce with itself such a nature; since the definition of every nature is the principle of its essential energy, which one who is fond of the myths of goat-stags would never say is double. And how, even if this is granted, will he who is by nature such, having one energy, and this natural, accomplish by the same [energy] the miracles and the passions, which differ from each other by the principle of nature, without a privation supervening on the loss of the state? For none of beings is by nature apt to do contrary things by one and the same energy, being contained by the definition and principle of nature. Therefore it is not lawful to speak of one energy simply or a natural energy in Christ of the divinity and the flesh, if divinity and flesh are not the same in natural quality, and also in nature, and the trinity will become a tetrad.

For neither according to nature, nor according to power, nor according to energy, did He become the same, he says, as the flesh. For in no way in which the Son is by nature the same as the Father and the Spirit through the one substance, has He become the same as the flesh through the union, even if He has made it life-giving by union with Himself, while it possesses what is by nature mortal. Since He will also be shown to be of a mutable nature, both having changed the substance of the flesh into what it was not, and having made the union the same as the nature. For let us understand the theandric energy as it was rendered; which He, in His life according to our nature, renewed for us, not for Himself, with things beyond nature. For a way of life is a life conducted according to the law of nature. But the Lord, being double in nature, was fittingly seen to have a suitable life, composed unconfusedly at the same time according to both divine and human law; itself also new, not only as foreign to those on earth and paradoxical, and thus distinguished from the nature of beings, but also as a character of the new energy of Him who lived in a new way. Which he perhaps called theandric, who devised a fitting name for this mystery, in order to show the mode of the communication of properties according to the ineffable union, which makes, by way of exchange, the things naturally belonging to each part of Christ to belong to the other, without the change and confusion of each part towards the other according to the natural (1060) principle. For just as of the heated sword the cutting [property] has become burning, and the burning cutting (for the fire was united as it were to the iron), so also to the cutting [property] of the iron the burning [property] of the fire, and the iron indeed became burning by union with the fire, and the fire cutting by union with the iron; but neither in any way has suffered from the mutual permeation into the other according to the union, but each has remained, even in the property of the composite according to union, without lapsing from its own natural [property]; so also in the mystery

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τῆς διαφορᾶς τόν λόγον ὁ τῆς ἑνώσεως τρόπος ἔχει σωζόμενον, ἄρα περίφρασίς ἐστιν ἡ τοῦ ἁγίου φωνή, καταλλήλῳ κλήσει τοῦ διττοῦ τήν φύσιν Χριστοῦ τήν διττήν παραδηλοῦντος ἐνέργειαν· εἴπερ φύσει τε καί ποιότητι κατ᾿ οὐδένα τρόπον ἐκ τῆς ἑνώσεως ὁ τῶν ἡνωμένων οὐσιώδης μεμείωται λόγος. Ἀλλ᾿ οὐχ ὥς τινι, ἀποφάσει τῶν ἄκρων τινός μέσου ποιουμένου κατάφασιν. Οὐκ ἔστι γάρ τι μέσον ἐπί Χριστοῦ, τῇ τῶν ἄκρων ἀποφάσει καταφασκόμενον. " Καινήν μέν," ὡς κοινοῦ μυστηρίου χαρακτηριστικήν, οὗ λόγος ἐστίν ὁ ἀπόῤῥητος τρόπος (1057) τῆς συμφυΐας. Τίς γάρ ἔγνω πῶς σαρκοῦται Θεός, καί μένει Θεός; πῶς μένων Θεός ἀληθής, ἄνθρωπός ἐστιν ἀληθής; ἄμφω δεικνύς ἑαυτόν ἀληθῶς ὑπάρξει φυσικῇ, καί δι' ἐκατέρου θάτερον, καί μηδετέρῳ τρεπόμενος. Ταῦτα μόνη πίστις χωρεῖ, σιγῇ τιμῶσα τόν Λόγον, οὗτινος τῇ φύσει τῶν ὄντων ἐμπέφυκε λόγος οὐδείς. "Θεανδρικήν" δέ, οὐχ ὡς ἁπλῆν, οὐδέ πρᾶγμά τι σύνθετον, καί ἤ μόνης γυμνῆς κατά φύσιν θεότητος, ἤ μόνης ψιλῆς ὑπάρχουσαν ἀνθρωπότητος, ἤ συνθέτῳ φύσει τινῶν ἄκρων μεταιχμίῳ προσήκουσαν, ἀλλ᾿ ἀνδρωθέντι Θεῷ, τουτέστι τελείως ἐνανθρωπήσαντι, προσφυεστάτην. Οὐδ᾿ αὖ πάλιν μίαν, ὡς οὐκ ἄν ἄλλως νοηθῆναι "τῆς καινῆς" καθά τισιν ἔδοξεν, ἤ "μιᾶς δυναμένης·" ποιότητος γάρ, ἀλλ᾿ οὐ ποσότητος ἡ "καινότης·" ἐπεί καί φύσιν ἐξ ἀνάγκης ἑαυτῇ συνεισάξει τοιαύτην· εἴπερ πάσης φύσεως ὅρος ὁ τῆς οὐσιώδους αὐτῆς ἐνεργείας καθέστηκε λόγος, ἥν οὐ διπλῆν εἴποι ποτ᾿ ἄν τραγελάφων μύθοις φιλοτιμούμενος. Πῶς δέ καί τούτου δοθέντος ὁ τοῦτο πεφυκώς μίαν ἔχων ἐνέργειαν, καί ταύτην φυσικήν, ἐπιτελέσει τῇ αὐτῇ τά θαύματα καί τά πάθη, λόγῳ φύσεως ἀλλήλων διαφέροντα, δίχα στερήσεως ἐπισυμβαινούσης τῇ ἀπογενέσει τῆς ἕξεως; Οὐδέν γάρ τῶν ὄντων μιᾷ καί τῇ αὐτῇ ἐνεργείᾳ τἀναντία πέφυκε δρᾷν, ὅρῳ τε καί λόγῳ συνεχόμενον φύσεως. ∆ιό μίαν ἁπλῶς ἤ φυσικήν ἐπί Χριστοῦ θεότητος καί σαρκός ἐνέργειαν λέγειν οὐ θέμις, εἴπερ μή ταυτόν ποιότητι φυσικῇ θεότης καί σάρξ, ἐπί καί φύσιν, καί γενήσεται τετράς ἡ τριάς.

Οὔτε γάρ κατά φύσιν, οὔτε κατά δύναμιν, οὔτε κατ᾿ ἐνέργειαν, γέγονε ταυτόν, φησί, τῇ σαρκί. Οὐδενί γάρ ᾦ πέφυκεν εἶναι διά τήν μίαν οὐσίαν Πατρί καί Πνεύματι ταυτόν ὁ Υἱός, γέγονε ταυτόν τῇ σαρκί διά τήν ἕνωσιν, κἄν πεποίηκεν αὐτήν ζωοποιόν ἑνώσει τῇ πρός αὐτόν, ἔχουσαν τό φύσει θνητόν. Ἐπεί καί τρεπτῆς ὑπάρχων δειχθήσεται φύσεως, καί τήν οὐσίαν τῆς σαρκός εἰς ὅπερ οὐκ ἦν ἀλλοιώσας, καί ταυτόν πεποιηκώς τῇ φύσει τήν ἕνωσιν. Τήν γάρ θεανδρικήν ἐνέργειαν, ὡς ἀπεδόθη νοήσωμεν· ἥν ἡμῖν οὐχ ἑαυτῷ πολιτευσάμενος τήν φύσιν τοῖς ὑπέρ φύσιν ἐκαίνισε. Πολιτεία γάρ ἐστι βίος κατά νόμον φύσεως διεξαγόμενος. ∆ιπλοῦς δέ ὤν τήν φύσιν ὁ Κύριος, εἰκότως βίον ἔχων ἐφάνη κατάλληλον, νόμῳ τε θείῳ καί ἀνθρωπίνῳ, κατά ταυτόν ἀσυγχύτως συγκεκροτημένον· καινόν καί αὐτόν, οὐχ ὡς μόνον ξένον τοῖς ἐπί γῆς καί παράδοξον, καί οὕτω τῇ φύσει τῶν ὄντων διεγνωσμένον, ἀλλά καί χαρακτῆρα καινῆς τοῦ καινῶς βιώσαντος ἐνεργείας. Ἥν θεανδρικήν τυχόν προσηγόρευσεν ὁ τῷ μυστηρίῳ τούτῳ κλῆσιν ἐπινοήσας ἁρμόδιον, ἵνα δείξῃ τόν κατά τήν ἀπόῤῥητον ἕνωσιν τῆς ἀντιδόσεως τρόπον, κατ᾿ ἐπαλλαγήν τά φυσικῶς ἑκατέρῳ μέρει τοῦ Χριστοῦ προσόντα θατέρῳ πεποιημένον, χωρίς τῆς ἑκατέρου μέρους πρός θάτερον κατά τόν φύσει (1060) λόγον μεταβολῆς καί συμφύρσεως. Ὥσπερ γάρ τοῦ πυρακτωθέντος ξίφους τό τμητικόν γέγονε καυστικόν, καί τό καυστικόν τμητικόν (ἡνώθη γάρ ὥσπερ σιδήρῳ τό πῦρ), οὕτω καί τῷ τοῦ σιδήρου τμητικῷ τό τοῦ πυρός καυστικόν, καί γέγονε μέν καυστικός ὁ σίδηρος ἑνώσει τῇ πρός τό πῦρ, καί τμητικόν τό πῦρ ἑνώσει τῇ πρός τόν σίδηρον· οὐδέτερον δέ τρόπον τῇ καθ᾿ ἕνωσιν ἀντιδύσει πρός θάτερον πέπονθεν, ἀλλ᾿ ἑκάτερον κἀν τῇ τοῦ συγκειμένου καθ᾿ ἕνωσιν ἰδιότητι μεμένηκε τῆς κατά φύσιν οἰκείας ἀνέκπτωτον· οὕτω κἀν τῷ μυστηρίῳ