Letters

⁹ When they argue thus, they fail to perceive the contradiction in which they involve themselves. For even though they say that the Body is not from Mary, but is coessential with the Word, yet none the less (the very point they dissemble, to avoid being credited with their real opinion) this on their own premises can be proved to involve a Tetrad. For as the Son, according to the Fathers, is coessential with the Father, but is not the Father Himself, but is called coessential, as Son with Father, so the Body, which they call coessential with the Word, is not the Word Himself, but a distinct entity.

But if so, on their own showing, their Triad will be a Tetrad. For the true, really perfect and indivisible Triad is not accessible to addition as is the Triad imagined by these persons. And how do these remain Christians who imagine another God in addition to the true one? For, once again, in their other fallacy one can see how great is their folly. For if they think because it is contained and stated in the Scriptures, that the Body of the Saviour is human and derived from Mary, that a Tetrad is substituted for a Triad, as though the Body created an addition, they go very far wrong, so much so as to make the creature equal to the Creator, and suppose that the Godhead can receive an addition.

And they have failed to perceive that the Word has become Flesh, not by reason of an addition to the Godhead, but in order that the flesh may rise again. Nor did the Word proceed from Mary that He might be bettered, but that He might ransom the human race. How then can they think that the Body, ransomed and quickened by the Word, made an addition in respect of Godhead to the Word that had quickened it? For on the contrary, a great addition has accrued to the human Body itself from the fellowship and union of the Word with it.

For instead of mortal it has become immortal; and, though an animal body, it has become spiritual, and though made from earth it entered the heavenly gates. The Triad, then, although the Word took a body from Mary, is a Triad, being inaccessible to addition or diminution; but it is always perfect, and in the Triad one Godhead is recognised, and so in the Church one God is preached, the Father of the Word.