“…the Son of God being made the Son of man, that through Him we may receive the adoption—humanity sustaining, and receiving, and embracing the Son of God” (Against the Heresies, III.16.3).
“Now this is His Word, our Lord Jesus Christ, who in the last times was made a man among men, that He might join the end to the beginning, that is, man to God. Wherefore, the prophets, receiving the prophetic gift from the same Word, announced His advent according to the flesh, by which the blending and communion of God and man took place according to the good pleasure of the Father, the Word of God foretelling from the beginning that God should be seen by men, and hold converse with them upon the earth, should confer with them, and should be present with His own creation, saving it, and becoming capable of being perceived by it, and freeing us from the hands of all that hate us, that is, from every spirit of wickedness; and causing us to serve Him in holiness and righteousness all our days, in order that man, having embraced the Spirit of God, might pass into the glory of the Father” (Against the Heresies, IV.20.4)
“He might easily have come to us in His immortal glory, but in that case we could never have endured the greatness of the glory; and therefore it was that He, who was the perfect bread of the Father, offered Himself to us as milk, [because we were infants]. He did this when He appeared as a man, that we, being nourished, as it were, from the breast of His flesh, and having, by such a course of milk-nourishment, become accustomed to eat and drink the Word of God, may be able also to contain in ourselves the Bread of immortality, which is the Spirit of the Father” (Against the Heresies, IV.38.1).
“It was for this reason that the Son of God, although He was perfect, passed through the stage of infancy in common with the rest of mankind, partaking of it thus not for His own benefit, but for that of the infantile stage of man’s existence, in order that man might be able to receive Him” (Against the Heresies, IV.38.1).