on the Real Presence

Origen on Prayer ch 3 (185-254 ad)
Already, it must be said, the adverse inworking, with intent to wrap the most impious of opinions around the name of Christ and around the teaching of the Son of God, has made some converts on the needlessness of prayer—a sentiment which find champions in those who by every means do away with outward forms, eschewing baptism and eucharist alike, misrepresenting the Scriptures as not actually meaning this that we call prayer but as teaching something quite different from it.
Origen Commentary on the Gospel of John book 10 ch 13 (185-254 ad)
For My flesh is meat indeed and My blood is drink indeed. He that eateth My flesh and drinketh My blood abideth in Me, and I in him,"--then the flesh thus spoken of is that of the Lamb that takes away the sin of the world; and this is the blood, some of which was to be put on the two side posts of the door, and on the lintels in the houses, in which we eat the passover. Of the flesh of this Lamb it is necessary that we should eat in the thee of the world
Origen Against Celsus book 8 ch 22 (185-254)
Again, he who considers that "Christ our Passover was sacrificed for us," and that it is his duty to keep the feast by eating of the flesh of the Word,
Origen Against Celsus book 8 ch 33 (185-254)
But we give thanks to the Creator of all, and, along with thanksgiving and prayer for the blessings we have received, we also eat the bread presented to us; and this bread becomes by prayer a sacred body, which sanctifies those who sincerely partake of it...
Origen Commentary on the Gospel of Matthew book 11 par 14 (185-254 ad)
But many things might be said about the Word Himself who became flesh, and true meat of which he that eateth shall assuredly live for ever, no worthless person being able to eat it; for if it were possible for one who continues worthless to eat of Him who became flesh. who was the Word and the living bread, it would not have been written, that "every one who eats of this bread shall live for ever."