All things are delivered unto me of my Father: and no man knows the Son, but the Father; neither knows any man the Father, except the Son, and he to whomever the Son will reveal him.
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Cyril of Alexandria
AD 444
The one who sees the Son, who has the image of the Father in himself, sees the Father himself. … These things are to be understood in a manner befitting to God. He said, “Everything has been handed down to me” so that he might not seem to be a member of a different species or inferior to the Father. Jesus added this in order to show that his nature is ineffable and inconceivable, like the Father’s. For only the divine nature of the Trinity comprehends itself. Only the Father knows his own Son, the fruit of his own substance. Only the divine Son recognizes the One by whom he has been begotten. Only the Holy Spirit knows the deep things of God, the thought of the Father and the Son.