27 All things are delivered to me by my Father. . . .
Jerome: When He says, “All things are committed to him,” He may mean, not the heaven and earth and the elements, and the rest of the things which He created and made, but those who through the Son have access to the Father.
Augustine: If He has aught less in His power than the Father has, then all that the Father has, are not His; for by begetting Him the Father gave power to the Son, as by begetting Him He gave all things which He has in His substance to Him whom He begot of His substance.
27 . . . And no one knoweth the Son, but the Father: neither doth any one know the Father, but the Son, and he to whom it shall please the Son to reveal him.
Hilary: In the mutual knowledge between the Father and the Son, He teaches us that there is nothing in the Son beyond what was in the Father.
Chrysostom: By this that He only knows the Father, He shews covertly that He is of one substance with the Father.
Hilary: This mutual knowledge proclaims that they are of one substance, since He that should know the Son, should know the Father also in the Son, since all things were delivered to Him by the Father.
Augustine: Because their substance is inseparable, it is enough sometimes to name the Father, sometimes the Son; nor is it possible to separate from either His Spirit, who is especially called the Spirit of truth.
The Father is revealed by the Son, that is, by His Word. For if the temporal and transitory word which we utter both shews itself, and what we wish to convey, how much more the Word of God by which all things were made, which so shews the Father as He is Father.
The Father may be known not only by the Son, but also by those to whom the Son shall reveal Him. . . . Both the Father and the Son Himself are revealed by the Son, inasmuch as He is the light of our mind. . . . The Father declares Himself by His Word, but the Word declares not only that which is intended to be declared by it, but in declaring this declares itself.
Chrysostom: If then He reveals the Father, He reveals Himself also.
Herein also He instructs us that He is so one with the Father, that it is not possible for any to come to the Father, but through the Son.
Scripture from the Douay-Rheims Bible. Commentary from St. Thomas Aquinas, Catena Aurea, Vol. I (London: Rivington, 1842).