Furthermore, Christ still bore the likeness of the body of sin; consequently He fittingly allowed Himself to be touched by sinners. But as soon as the body of sin was taken away by the glory of the Resurrection, he forbade the woman to touch Him, for her faith in Him was defective, according to John 20:17: "Do not touch Me, for I am not yet ascended to My Father," i.e. "in your heart," as Augustine explains (Tract. cxxi in Joan.). And therefore sinners, who lack living faith regarding Christ are not allowed to touch this sacrament.
Reply Obj. 2: Every medicine does not suit every stage of sickness; because the tonic given to those who are recovering from fever would be hurtful to them if given while yet in their feverish condition. So likewise Baptism and Penance are as purgative medicines, given to take away the fever of sin; whereas this sacrament is a medicine given to strengthen, and it ought not to be given except to them who are quit of sin.
Reply Obj. 3: By the greatest gifts Augustine understands the soul's virtues, "which no one uses to evil purpose," as though they were principles of evil. Nevertheless sometimes a man makes a bad use of them, as objects of an evil use, as is seen in those who are proud of their virtues. So likewise this sacrament, so far as the sacrament is concerned, is not the principle of an evil use, but the object thereof. Hence Augustine says (Tract. lxii in Joan.): "Many receive Christ's body unworthily; whence we are taught what need there is to beware of receiving a good thing evilly . . . For behold, of a good thing, received evilly, evil is wrought": just as on the other hand, in the Apostle's case, "good was wrought through evil well received," namely, by bearing patiently the sting of Satan.
Reply Obj. 4: Christ's body is not received by being seen, but only its sacrament, because sight does not penetrate to the substance of Christ's body, but only to the sacramental species, as stated above (Q. 76, A. 7). But he who eats, receives not only the sacramental species, but likewise Christ Himself Who is under them. Consequently, no one is forbidden to behold Christ's body, when once he has received Christ's sacrament, namely, Baptism: whereas the non-baptized are not to be allowed even to see this sacrament, as is clear from Dionysius (Eccl. Hier. vii). But only those are to be allowed to share in the eating who are united with Christ not merely sacramentally, but likewise really.
Reply Obj. 5: The fact of a man being unconscious of his sin can come about in two ways. First of all through his own fault, either because through ignorance of the law (which ignorance does not excuse him), he thinks something not to be sinful which is a sin, as for example if one guilty of fornication were to deem simple fornication not to be a mortal sin; or because he neglects to examine his conscience, which is opposed to what the Apostle says (1 Cor. 11:28): "Let a man prove himself, and so let him eat of that bread, and drink of the chalice." And in this way nevertheless the sinner who receives Christ's body commits sin, although unconscious thereof, because the very ignorance is a sin on his part.
Secondly, it may happen without fault on his part, as, for instance, when he has sorrowed over his sin, but is not sufficiently contrite: and in such a case he does not sin in receiving the body of Christ, because a man cannot know for certain whether he is truly contrite. It suffices, however, if he find in himself the marks of contrition, for instance, if he "grieve over past sins," and "propose to avoid them in the future" [*Cf. Rule of Augustine]. But if he be ignorant that what he did was a sinful act, through ignorance of the fact, which excuses, for instance, if a man approach a woman whom he believed to be his wife whereas she was not, he is not to be called a sinner on that account; in the same way if he has utterly forgotten his sin, general contrition suffices for blotting it out, as will be said hereafter (Suppl., Q. 2, A. 3, ad 2); hence he is no longer to be called a sinner. _______________________
FIFTH ARTICLE [III, Q. 80, Art. 5]
Whether to Approach This Sacrament with Consciousness of Sin Is the
Gravest of All Sins?
Objection 1: It seems that to approach this sacrament with consciousness of sin is the gravest of all sins; because the Apostle says (1 Cor. 11:27): "Whosoever shall eat this bread, or drink the chalice of the Lord unworthily, shall be guilty of the body and of the blood of the Lord": upon which the gloss observes: "He shall be punished as though he slew Christ." But the sin of them who slew Christ seems to have been most grave. Therefore this sin, whereby a man approaches Christ's table with consciousness of sin, appears to be the gravest.
Obj. 2: Further, Jerome says in an Epistle (xlix): "What hast thou to do with women, thou that speakest familiarly with God at the altar?" [*The remaining part of the quotation is not from St. Jerome]. Say, priest, say, cleric, how dost thou kiss the Son of God with the same lips wherewith thou hast kissed the daughter of a harlot? "Judas, thou betrayest the Son of Man with a kiss!" And thus it appears that the fornicator approaching Christ's table sins as Judas did, whose sin was most grave. But there are many other sins which are graver than fornication, especially the sin of unbelief. Therefore the sin of every sinner approaching Christ's table is the gravest of all.