Some, following Jewish teaching rather than the Gospel, naturally supposed that the knowledge and confession of the one God of all was sufficient for right faith. They did not strive to know the doctrine of the Holy and Consubstantial Trinity. Therefore Christ necessarily, in a certain way, excludes knowledge of God from those who think in this manner, unless they are willing to receive Him also. This is because one must come to God the Father through the Son. In like manner, through contemplation of the Begotten, we shall come to the Begetter Himself. For there is no doubt that whoever believes in the Son’s existence as Son, that is, from the essence of Him who begot Him, certainly also knows the Father. Thus one may understand the saying with regard to the simplest and most unsearching knowledge. But if anyone wishes also to turn to the investigation of the matter itself through subtle contemplation, he too will find the truth in the Son’s words. The divine nature is, indeed, wholly inaccessible to every mind. To dare to investigate completely what the Creator of all is according to essence is a sign of utter derangement. Yet it is partly possible for us to gather some knowledge, as though in shadows and riddles. It is as though an enumeration of the excellences belonging to the Son’s nature presented a mirror to the mind. From what He Himself is, and from what was accomplished by Him when He became man and before His Incarnation, each person may fittingly come at last to contemplation of Him who begot Him. Observe, I ask you, the glory and power belonging to Him. Keep in view His unlimited authority over all things. Tell me, what, even among things surpassing reason, is not ordered by His free commands, both before the flesh and with the flesh? Having shown Himself to us as such through His very works, He says: “I and the Father are one. He who has seen Me has seen the Father” (Jn 10:30; 14:9). Therefore, according to the meaning of this saying, one must pass from the image to the prototype. From the reflection, surely, one must pass to Him whose reflection it is. We do not say, as some who are accustomed to think otherwise do, that the Son is made like the Father by certain acquired and external dignities. Nor do we say, as it seems to those who err, that He is called the image of God the Father because, though possessing His glory, power, and wisdom, He has another nature. Their babbling and ornate outpourings of words, or rather their impiety, were devised to distort and abolish the Son’s consubstantiality, in accord with their impious and God-opposing aim. But as Son, truly, ineffably, and beyond reason begotten from the essence of God the Father, He is His impress, image, and reflection. In His own nature He bears the property of the essence of Him who begot Him, and the beauty of His natural excellences. Let us not be mad like them. Let us not bring our mind to such impiety that we call one who is not God by nature like God. Let us not ascribe the glory of God to one not begotten from the essence of God the Father. Nor let us say that what is wholly created and brought from non-being into being can ever truly bear all divine power and wisdom. Nor can it be such as the divine and ineffable nature of God the Father must be understood to be. Indeed, in that case, what difference would there be between Creator and creature? What could serve as a mediating distinction of the identity of essence between creation and Creator? For if it wholly possesses His glory, power, and wisdom equally with God the Father, I could not say at all what greater thing there would be in Him. Nor could I say what superiority He would have over us or over creation. I suppose they also will prove unable to say. Therefore we do not present the Son as equal to the Father by external dignities. Nor is He like someone represented before us in a drawing on a board, portraying and replacing the form of a king by a varied combination of colors. Rather, He is the inscription and true image of Him who begot Him. In His own and natural qualities He makes manifest the nature of the Father. For this reason we say that it is impossible for anyone to know the Father unless he first knows Him, that is, the Son. “And from henceforth you know Him, and have seen Him.” I consider worthy of wonder the arrangement belonging to this saying and its structure, which is difficult to express in words. In the words, “If you had known Me, you would have known My Father also,” He charged the disciples with ignorance of so necessary a matter. Yet He immediately indicated the opposite: “From henceforth you know Him, and have seen Him.” Since they were to become leaders of the churches spread everywhere, having heard from the Savior Himself, “Go and teach all nations” (Mt 28:19), He does this, I think, especially for this reason. Having beneficially indicated beforehand, and having spoken generally as if concerning all, that whoever has known the Son undoubtedly knows the Father and God from whom He is, He considers it useful to bear witness to knowledge in His disciples. He does this not for flattery, for He could not say anything untrue, but because they had truly learned and known. For no one of sound mind doubts that they knew and believed that the Lord is truly the Son of God. Otherwise, how did Nathanael, the true Israelite, as soon as he heard, “Before Philip called you, when you were under the fig tree, I saw you,” immediately utter his confession of faith? He said: “Rabbi, You are the Son of God. You are the King of Israel” (Jn 1:49-50). Likewise, when the sea was wondrously and extraordinarily calmed, did not those in the boat worship Him, “saying: Truly You are the Son of God” (Mt 14:33)? Can anyone who does not know that He is God and begotten of God the Father say such things? Otherwise, would such a one not have to be counted foolish? Again, near the borders of Caesarea Philippi, when Christ Himself asked them, “Who do men say that I, the Son of Man, am?” did they not first state the opinions of others? Some, it is said, regarded Him as Elijah, others as Jeremiah or one of the prophets. But they did not refuse to declare clearly, through the one who was foremost among them, what they themselves thought Him to be. This was Peter himself. Without hesitation they answered: “You are the Christ, the Son of the living God” (Mt 16:13-14, 16). Therefore, when Christ said, “If you had known Me, you would have known My Father also,” do not think that this saying was addressed only to the disciples themselves. Taking the person of the holy Apostles, He makes as it were a general definition for those everywhere. Notice that we must not consider them ignorant that He is God and the Son of God. But when God called Himself the way, they did not quite understand what seemed to be spoken enigmatically. Only in this respect must the fault of ignorance be found in them. Therefore, after reproving them in a few words because they could not understand what was not expressed plainly, He then sets forth from this a word common to all. He clearly teaches that the one who does not know the Son will also suffer harm with respect to the knowledge of the Father Himself. Then, as to disciples who had confessed the faith, He rightly bears witness to their knowledge with the words: “From henceforth you know Him, and have seen Him.” He uses the word “henceforth,” certainly not in the sense of from that hour or day when He spoke with them about this. He says “henceforth” by setting the present and new time of His coming against the ancient and first time. In this present time, knowledge of the Father through the Son has shone throughout the whole world. Therefore in the book of Psalms He says, as it were, to God the Father: “Wonderful is the knowledge of You because of Me” (Ps 138:6). And indeed, seeing the Son shining with miracles that surpass reason, and easily accomplishing whatever He wished with divine authority, we marveled at the knowledge of the Father received from this. By that knowledge we understand nothing other than the knowledge of the Son who has come forth from Him. Therefore, “from henceforth you know Him, and have seen Him.” We have known in the Son, as I have just said, who the Father is. We have not only known, but also beheld or seen. For knowledge indicates contemplation through thoughts, which can be received concerning the divine and ineffable nature, which is above all, through all, and in all. But to see indicates assurance through miracles. For we have not only learned that the Father is Life by nature. Nor have we received knowledge of this in ourselves only in a pure mental conception. In the Son, who gives life to the dead and raises those who have decayed back to being, we have learned not only that God the Father is Life by nature. We have also learned that He holds all creation in His authority and reigns as king over His creation, so that “all works are shaken and tremble because of Him” (2 Esdras 4:36), as it is written. We also see Him as such in the Son, when He rebuked the sea and winds and said with great authority: “Be silent, be still” (Mk 4:39). Therefore, since He intended to say not only that you have known the Father, but also that you have “seen” Him, He had to place the word “henceforth” first. For what reason? The Law of Moses proclaimed to the sons of Israel: “The Lord your God is one Lord” (Deut 6:4). It did not set forth for the ancients the doctrine of the Son. Rather, it tore them away from polytheism alone and called them to the worship of the One. But when our Lord Jesus Christ became man, He made the Father known to us through Himself by many signs and works. He showed the one nature of the Godhead, contemplated in the Holy Trinity and truly existing. Therefore He fittingly says “henceforth,” pointing to the imperfection of knowledge among those under the Law and those who live according to their rules. This also must be indicated: in saying that He Himself is seen in place of the Father, He does not abolish the true and distinct personal existence of God the Father, from whom He is. Nor does He say that He is the Father, insofar as this concerns the indication of person. But because He is consubstantial with the Father, He says that the Begetter is seen in Him. It is like the son of some man who, wishing to express the nature of his own father, points to himself and says to one desiring to know this: “You have seen my father in me.” Yet God, let us repeat, must be above all comparisons.