Clement of Alexandria
From “Paedagogus” (The Instructor). Book 1, chapter 6
“But you are not inclined to understand it thus, but perchance more generally. Hear it also in the following way.* The flesh figuratively represents to us the Holy Spirit;*** for the flesh was created by Him. The blood points out to us the Word, for as rich blood the Word has been infused into life; and the union of both is the Lord, the food of the babes–the Lord who is Spirit and Word. The food- that is, the Lord Jesus–that is, the Word of God, the Spirit made flesh, the heavenly flesh sanctified…”
Clement was teaching orthodox Christian doctrine, widely understood in the universal church at that time
And earlier in that chapter Clement said this:
But we are God-taught, and glory in the name of Christ. How then are we not to regard the apostle as attaching this sense to the milk of the babes? And if we who preside over the Churches are shepherds after the image of the good Shepherd, and you the sheep, are we not to regard the Lord as preserving consistency in the use of figurative speech, when He speaks also of the milk of the flock?…** Elsewhere the Lord, in the Gospel according to John, brought this out by symbols, when He said: “Eat ye my flesh, and drink my blood; ” describing distinctly by metaphor the drinkable properties of faith and the promise**, by means of which the Church, like a human being consisting of many members, is refreshed and grows, is welded together and compacted of both,–of faith, which is the body, and of hope, which is the soul; as also the Lord of flesh and blood. For in reality the blood of faith is hope, in which faith is held as by a vital principle.”
Clement continues his instruction that Christ is food with the metaphorical explanation.
“‘I,’ says the Lord, ‘have meat to eat that ye know not of. My meat is to do the will of Him that sent Me.’ You see another kind of food which,* similarly with milk, represents figuratively the will of God.*** Besides, also, the completion of His own passion He called catachrestically “a cup,” when He alone had to drink and drain it. Thus to Christ the fulfilling of His Father’s will was food; and to us infants, who drink the milk of the word of the heavens, Christ Himself is food. Hence seeking is called sucking; for to those babes that seek the Word, the Father’s breasts of love supply milk.”
And Clement concludes the chapter with this:
“Thus in many ways the Word is figuratively described, as meat, and flesh, and food, and bread, and blood, and milk. The Lord is all these, to give enjoyment to us who have believed on Him. Let no one then think it strange, when we say that the Lord’s blood is figuratively represented as milk. For is it not figuratively represented as wine? “Who washes,” it is said, “His garment in wine, His robe in the blood of the grape.” In His Own Spirit He says He will deck the body of the Word; as certainly by His own Spirit He will nourish those who hunger for the Word.”