Irenaeus on John 14:6 Around 180CE

For no one can know the Father, unless through the Word of God, that is, unless by the Son revealing [Him]; neither can he have knowledge of the Son, unless through the good pleasure of the Father. But the Son performs the good pleasure of the Father; for the Father sends, and the Son is sent, and comes. And His Word knows that His Father is, as far as regards us, invisible and infinite; and since He cannot be declared [by any one else], He does Himself declare Him to us; and on the other hand, it is the Father alone who knows His own Word. And both these truths has our Lord declared.

Therefore the Son reveals the knowledge of the Father through His own manifestation. For the manifestation of the Son is the knowledge of the Father; for all things are manifested through the Word. In order, therefore, that we might know that the Son who came is He who imparts to those believing on Him a knowledge of the Father, He said to His disciples: “No man knows the Son but the Father, nor the Father but the Son, and those to whomsoever the Son shall reveal Him;” thus setting Himself forth and the Father as He [really] is, that we may not receive any other Father, except Him who is revealed by the Son. …

For the Lord taught us that no man is capable of knowing God, unless he be taught of God; that is, that God cannot be known without God: but that this is the express will of the Father, that God should be known. For they shall know Him to whomsoever the Son has revealed Him. And for this purpose did the Father reveal the Son, that through His instrumentality He might be manifested to all, and might receive those righteous ones who believe in Him into incorruption and everlasting enjoyment (now, to believe in Him is to do His will); but He shall righteously shut out into the darkness which they have chosen for themselves, those who do not believe, and who do consequently avoid His light. The Father therefore has revealed Himself to all, by making His Word visible to all; and, conversely, the Word has declared to all the Father and the Son, since He has become visible to all. And therefore the righteous judgment of God [shall fall] upon all who, like others, have seen but have not, like others, believed. …

Him, therefore, I have rightly shown to be known by no man, unless by the Son, and to whomsoever the Son shall reveal Him. But the Son reveals the Father to all to whom He wills that He should be known; and neither without the goodwill of the Father nor without the agency of the Son, can any man know God. Wherefore did the Lord say to His disciples, “I am the way, the truth, and the life and no man comes to the Father but by Me. If you had known Me, you would have known My Father also: and from now on you have both known Him, and have seen Him.” From these words it is evident, that He is known by the Son, that is, by the Word.