Eucharistic theology is among the most ancient and contested domains of Christian doctrine, with clear evidence of high sacramental views from the earliest sources. Paul's account of the Last Supper frames the Eucharist as active proclamation of Christ's death until his return, demanding discerning participation to avoid judgment. John's discourse on the bread of life presses further into real presence: consuming Christ's flesh and blood grants abiding union with him and future resurrection. Chrysostom urged believers to approach the elements with pure faith as the entire presence of Christ for healing and eternal sustenance, while Augustine clarified that the eternal life given begins spiritually now, with bodily resurrection to follow. The tradition consistently resists reduction to bare memorialism without requiring the later medieval metaphysics of transubstantiation.
"The Lord Jesus the same night in which he was betrayed took bread... and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me... as often as ye eat this bread and drink this cup, ye do shew the Lord's death till he come" — Paul's account of the institution, framing the Eucharist as ongoing proclamation of the crucifixion and anticipation of the parousia, demanding worthy discernment from all who participate.
"Except ye eat the flesh of the Son of man and drink his blood, ye have no life in you. Whoso eateth my flesh and drinketh my blood hath eternal life; and I will raise him up at the last day... He that eateth my flesh and drinketh my blood dwelleth in me, and I in him" — the most direct scriptural basis for real presence, linking the Eucharist to indwelling union with Christ and future resurrection.
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