They fall into this through their evil-mindedness. They think that God is a body, and they do not understand what the true Father and the true Son are. They do not understand the invisible and eternal Light, nor His invisible Radiance. They do not understand the invisible Hypostasis, the bodiless impress, χαρακτὴρ, ὰσώματος, and the bodiless Image.
If they knew this, they would not mock and blaspheme the Lord of glory. They would not understand bodiless things bodily, nor distort what was spoken in a good sense. On hearing this, it would be enough to know what the Lord says and to believe. Faith in simplicity is better than excessive disputation.
But since they have resolved to revile even this in order to confirm their heresy, it is necessary to expose their evil-mindedness. For the protection of the faithful, the true meaning must be shown. The words, “I am in the Father, and the Father in Me,” do not mean what the heretics suppose.
They do not mean that They pass into one another, like empty vessels filled by each other. They do not mean that the Son fills an emptiness in the Father, and the Father fills an emptiness in the Son, while each is neither full nor perfect. Such a notion belongs to bodies. Even to say this is altogether impious.
The Father is full and perfect, and the Son is the fullness of the Godhead. Again, God is not in the Son as He is in the saints, giving them strength. The Son is the Father’s Power and Wisdom. Created beings are sanctified by the Spirit through communion with the Son. But the Son is not Son by participation. He is the Father’s own offspring.
Again, the Son is not in the Father in the sense in which we “live and move and have our being” in Him. The Son is life flowing from the Father as from a fountain, by which all things are made alive and exist. Life does not live by another life. Otherwise it would not be life. Rather, the Son Himself brings all things forth into life.
2. Let us see what Asterius, the defender of the heresy and the sophist, says. In rivalry with the Jews, he has written the following: “It is clear that He named Himself as being in the Father, and likewise the Father in Himself, thereby indicating that the word taught by Him is not His, but the Father’s, and that the works are not His own, but belong to the Father, who gave Him power.”
If a mere child had said this, his age would excuse him. But the writer is the so-called sophist, who declares of himself that he knows everything. What condemnation does he deserve? Does he not show himself alien to the Apostle, exalting himself with “persuasive words of wisdom” (1 Cor 2:4)? He thinks he can deceive by them, while he himself does not understand what he says or what he argues about.
What the Son named as proper and fitting to the Son alone, as Word, Wisdom, and Image of the Father’s essence, Asterius applies to all creatures. He makes it common both to the Son and to creatures. This lawless man speaks of the Father’s Power as though it receives power into itself. According to his impiety, he could consistently say that the Son was adopted as a son in a son, and that the Word received the authority of a word.
He still refuses to agree that this was spoken by the Son as Son. Instead, he places Him among all created beings, as though He had learned this. If the Savior said, “I am in the Father, and the Father in Me,” not because the words He uttered are the Son’s words, but because they are the Father’s words and works, then David also says, “I will hear what the Lord God will speak in me” (Ps 84:9). Solomon says, “My words have been spoken by God” (Prov 31:1).
Moses, too, was a minister of the words spoken by God. Each prophet spoke not from himself, but from God: “Thus says the Lord” (Zech 1:3). The saints did not call the works they performed their own, but ascribed them to God, who gave the power.
Thus Elijah and Elisha called upon God to raise the dead. After cleansing Naaman from leprosy, Elisha says to him, “May you know that there is a God in Israel.” Samuel himself, in the days of harvest, prayed to God that He would give rain. The apostles said that they worked signs not by their own power, but by the grace of the Lord.
From this it would follow that this saying could be common to all. Each one, like the Savior, could say, “I am in the Father, and the Father in Me.” Then He alone would no longer be the Son of God, the Word and Wisdom, but would only be numbered among many.
3. But if the Lord had spoken in this sense, He should not have said, “I am in the Father, and the Father in Me.” Rather, He should have said, “I too am in the Father. And the Father is also in Me.” This would show not His own and exclusive relation to the Father as Son, but a grace common to Him with all.
Yet He did not speak as the heretics think. Since they do not acknowledge that He is the genuine Son from the Father, they slander the genuine Son. To Him alone it belongs to say of Himself: “I am in the Father, and the Father in Me.”
The Son is in the Father, so far as this can be grasped, because the Son’s entire being properly belongs to the Father’s essence. The Son is from the Father, as radiance from light and as a stream from a fountain. Therefore, whoever sees the Son sees and contemplates what properly belongs to the Father. Thus the Son’s being, since it is from the Father, is also in the Father.
And the Father is in the Son. For what is properly from the Father is the Son. He is in the Son as the sun is in its radiance, as the mind is in its word, and as the fountain is in the stream. Thus whoever sees the Son sees and contemplates what properly belongs to the Father’s essence, because the Father is in the Son.
Since the Son’s being is the Father’s Image and the Father’s Godhead, it follows that the Son is in the Father, and the Father in the Son. Therefore the Savior rightly first said, “I and the Father are one” (Jn 10:30), and then added, “I am in the Father, and the Father in Me,” to show the identity of the Godhead and the unity of essence.