From the Early Church:
“They abstain from the Eucharist and from prayer because they do not confess that the Eucharist is the flesh of our Savior Jesus Christ, flesh which suffered for our sins and which that Father, in his goodness, raised up again. They who deny the gift of God are perishing in their disputes” – Ignatius of Antioch (letter to the Smyrnaeans about A.D. 110) Disciple of the Apostle John
“We call this food Eucharist, and no one else is permitted to partake of it, except one who believes our teaching to be true and who has been washed in the washing which is for the remission of sins and for regeneration [i.e., has received baptism] and is thereby living as Christ enjoined. For not as common bread nor common drink do we receive these; but since Jesus Christ our Savior was made incarnate by the word of God and had both flesh and blood for our salvation, so too, as we have been taught, the food which has been made into the Eucharist by the Eucharistic prayer set down by him, and by the change of which our blood and flesh is nurtured, is both the flesh and the blood of that incarnated Jesus” –Justin Martyr (A.D. 151)
“God speaks by the mouth of Malachi, one of the twelve [minor prophets], as I said before, about the sacrifices at that time presented by you: ‘I have no pleasure in you, says the Lord, and I will not accept your sacrifices at your hands; for from the rising of the sun to the going down of the same, my name has been glorified among the Gentiles, and in every place incense is offered to my name, and a pure offering, for my name is great among the Gentiles . . . [Mal. 1:10–11]. He then speaks of those Gentiles, namely us [Christians] who in every place offer sacrifices to him, that is, the bread of the Eucharist and also the cup of the Eucharist”-Justin Martyr ([A.D. 155).
“I wish to admonish you with examples from your religion. You are accustomed to take part in the divine mysteries, so you know how, when you have received the Body of the Lord, you reverently exercise every care lest a particle of it fall and lest anything of the consecrated gift perish. You account yourselves guilty, and rightly do you so believe, if any of it be lost through negligence”.- Origen (A.D. 244)
“[T]here is not a soul that can at all procure salvation, except it believe whilst it is in the flesh, so true is it that the flesh is the very condition on which salvation hinges. And since the soul is, in consequence of its salvation, chosen to the service of God, it is the flesh which actually renders it capable of such service. The flesh, indeed, is washed [in baptism], in order that the soul may be cleansed . . . the flesh is shadowed with the imposition of hands [in confirmation], that the soul also may be illuminated by the Spirit; the flesh feeds [in the Eucharist] on the body and blood of Christ, that the soul likewise may be filled with God”-Tertullian (A.D. 210).
“Do not, therefore, regard the bread and wine as simply that, for they are, according to the Master’s declaration, the body and blood of Christ. Even though the senses suggest to you the other, let faith make you firm. Do not judge in this matter by taste, but be fully assured by faith, not doubting that you have been deemed worthy of the body and blood of Christ” – Cyril of Jerusalem (A.D. 350)
“Christ was carried in his own hands when, referring to his own body, he said, ‘This is my body’ [Matt. 26:26]. For he carried that body in his hands” –Augustine (A.D. 405).
“For when he says in another book, which is called Ecclesiastes, ‘There is no good for a man except that he should eat and drink’ [Eccles. 2:24], what can he be more credibly understood to say [prophetically] than what belongs to the participation of this table which the Mediator of the New Testament himself, the priest after the order of Melchizedek, furnishes with his own body and blood? For that sacrifice has succeeded all the sacrifices of the Old Testament, which were slain as a shadow of what was to come. . . . Because, instead of all these sacrifices and oblations, his body is offered and is served up to the partakers of it” – Augustine (The City of God A.D. 419).
“We will necessarily add this also. Proclaiming the death, according to the flesh, of the only-begotten Son of God, that is Jesus Christ, confessing his resurrection from the dead, and his ascension into heaven, we offer the unbloody sacrifice in the churches, and so go on to the mystical thanksgivings, and are sanctified, having received his holy flesh and the precious blood of Christ the Savior of us all. And not as common flesh do we receive it; God forbid: nor as of a man sanctified and associated with the Word according to the unity of worth, or as having a divine indwelling, but as truly the life-giving and very flesh of the Word himself. For he is the life according to his nature as God, and when he became united to his flesh, he made it also to be life-giving” –Council of Ephesus (A.D. 431).
“What then? Do we not offer daily? Yes, we offer, but making remembrance of his death; and this remembrance is one and not many. How is it one and not many? Because this sacrifice is offered once, like that in the Holy of Holies. This sacrifice is a type of that, and this remembrance a type of that. We offer always the same, not one sheep now and another tomorrow, but the same thing always. Thus there is one sacrifice. By this reasoning, since the sacrifice is offered everywhere, are there, then, a multiplicity of Christs? By no means! Christ is one everywhere. He is complete here, complete there, one body. And just as he is one body and not many though offered everywhere, so too is there one sacrifice”. – John Chrysostom (A.D. 403)