John Chrysostom
How does anyone trample the Son of God? If, while communing of Him in the Mysteries, he commits sins, tell me, does he not trample Him? Does he not despise Him? Just as we treat trampled people as nothing, so sinners treat Christ as nothing, and therefore they sin.
You have become the body of Christ, and do you hand yourself over to the devil so that he may trample you?
"And regards as unholy the blood of the covenant," he says, "by which he was sanctified." What does "unholy" mean? Unclean, or no better at all than anything else.
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"And insults the Spirit of grace," because one who does not receive a benefit insults the benefactor. Christ made you a son, and do you wish to be a slave? He came to dwell in you, and do you bring evil thoughts into yourself? Christ wishes to dwell in you, and do you trample Him by gluttony and drunkenness?
Listen, you who partake of the Mysteries unworthily. Listen, you who approach this table unworthily: "Do not give," He says, "what is holy to the dogs, nor cast your pearls before swine, lest they trample them under their feet" (Mt 7:6). That is, lest they disregard and spit upon them.
But the Apostle did not speak so. He spoke still more fearfully. He strikes souls with fear, since this could act upon them no less than exhortation. He shows the difference between rejecting the law of Moses and trampling Christ's blood, but leaves them to judge the punishment for the latter as an obvious matter.
"Of how much worse punishment, do you suppose," he says, "will he be counted worthy?" Here, it seems to me, he means the Mysteries.