John Chrysostom
Catena Aurea · Lukasevangelium 22
And he took bread, and gave thanks, and brake it, and gave unto them, saying, This is my body which is given for you: this do in remembrance of me. Likewise also the cup after supper, saying, This cup is the new testament in my blood, which is shed for you.
(Hom. 46. in Joan.) For this Blood moulds in us a royal image, it suffers not our nobleness of soul to waste away, moreover it refreshes the soul, and inspires it with great virtue. This Blood puts to flight the devils, summons angels, and the Lord of angels. This Blood poured forth washed the world, and made heaven open. They that partake of it are built up with heavenly virtues, and arrayed in the royal robes of Christ; yea rather clothed upon by the King Himself. And since if thou comest clean, thou comest healthfully; so if polluted by an evil conscience, thou comest to thy own destruction, to pain and torment. For if they who defile the imperial purple are smitten with the same punishment as those who tear it asunder, it is not unreasonable that they who with an unclean heart receive Christ should be beaten with the same stripes as they were who pierced Him with nails.