Communion and Dignity

Father Felice Cappello, S.J., noted commentator on the Pio-Benedictine Code, describes the principle which underlies the discipline of can. 855. He reminds us that the minister of Holy Communion is held, under pain of mortal sin, to deny the sacraments to the unworthy, that is, "to those who are indeed a capable subject of the sacrament, but are not able to receive its effect, because they are in the state of mortal sin without the will of reforming themselves." Basing himself on Saint Thomas Aquinas and Saint Alphonsus Liguori, Father Cappello goes on to explain the reason for the discipline:
The dignity itself of the sacraments and the virtue of religion demand it, lest sacred things be exposed to profanation; the fidelity of the minister demands it, who is forbidden to give holy things to the dogs and to throw pearls before the swine; the law of charity demands it, lest the minister cooperate with those who unworthily attempt and dare to receive the sacraments, and offer scandal.

Original "Off The Record" link (here)