Reply Obj. 1: In the sacrament of Baptism a man is conformed to Christ's death, by receiving His character within him. And therefore, as Christ died but once, so a man ought to be baptized but once. But a man does not receive Christ's character in this sacrament; He receives Christ Himself, Whose virtue endures for ever. Hence it is written (Heb. 10:14): "By one oblation He hath perfected for ever them that are sanctified." Consequently, since man has daily need of Christ's health-giving virtue, he may commendably receive this sacrament every day.
And since Baptism is above all a spiritual regeneration, therefore, as a man is born naturally but once, so ought he by Baptism to be reborn spiritually but once, as Augustine says (Tract. xi in Joan.), commenting on John 3:4, "How can a man be born again, when he is grown old?" But this sacrament is spiritual food; hence, just as bodily food is taken every day, so is it a good thing to receive this sacrament every day. Hence it is that our Lord (Luke 11:3), teaches us to pray, "Give us this day our daily bread": in explaining which words Augustine observes (De Verb. Dom., Serm. xxviii): "If you receive it," i.e. this sacrament, every day, "every day is today for thee, and Christ rises again every day in thee, for when Christ riseth it is today."
Reply Obj. 2: The Paschal Lamb was the figure of this sacrament chiefly as to Christ's Passion represented therein; and therefore it was partaken of once a year only, since Christ died but once. And on this account the Church celebrates once a year the remembrance of Christ's Passion. But in this sacrament the memorial of His Passion is given by way of food which is partaken of daily; and therefore in this respect it is represented by the manna which was given daily to the people in the desert.
Reply Obj. 3: Reverence for this sacrament consists in fear associated with love; consequently reverential fear of God is called filial fear, as was said in the Second Part (I-II, Q. 67, A. 4, ad 2; II-II, Q. 19, AA. 9, 11, 12); because the desire of receiving arises from love, while the humility of reverence springs from fear. Consequently, each of these belongs to the reverence due to this sacrament; both as to receiving it daily, and as to refraining from it sometimes. Hence Augustine says (Ep. liv): "If one says that the Eucharist should not be received daily, while another maintains the contrary, let each one do as according to his devotion he thinketh right; for Zaccheus and the Centurion did not contradict one another while the one received the Lord with joy, whereas the other said: 'Lord I am not worthy that Thou shouldst enter under my roof'; since both honored our Saviour, though not in the same way." But love and hope, whereunto the Scriptures constantly urge us, are preferable to fear. Hence, too, when Peter had said, "Depart from me, for I am a sinful man, O Lord," Jesus answered: "Fear not."
Reply Obj. 4: Because our Lord said (Luke 11:3), "Give us this day our daily bread," we are not on that account to communicate several times daily, for, by one daily communion the unity of Christ's Passion is set forth.
Reply Obj. 5: Various statutes have emanated according to the various ages of the Church. In the primitive Church, when the devotion of the Christian faith was more flourishing, it was enacted that the faithful should communicate daily: hence Pope Anaclete says (Ep. i): "When the consecration is finished, let all communicate who do not wish to cut themselves off from the Church; for so the apostles have ordained, and the holy Roman Church holds." Later on, when the fervor of faith relaxed, Pope Fabian (Third Council of Tours, Canon 1) gave permission "that all should communicate, if not more frequently, at least three times in the year, namely, at Easter, Pentecost, and Christmas." Pope Soter likewise (Second Council of Chalon, Canon xlvii) declares that Communion should be received "on Holy Thursday," as is set forth in the Decretals (De Consecratione, dist. 2). Later on, when "iniquity abounded and charity grew cold" (Matt. 24:12), Pope Innocent III commanded that the faithful should communicate "at least once a year," namely, "at Easter." However, in De Eccles. Dogmat. xxiii, the faithful are counseled "to communicate on all Sundays." _______________________
ELEVENTH ARTICLE [III, Q. 80, Art. 11]
Whether It Is Lawful to Abstain Altogether from Communion?
Objection 1: It seems to be lawful to abstain altogether from Communion. Because the Centurion is praised for saying (Matt. 8:8): "Lord, I am not worthy that Thou shouldst enter under my roof"; and he who deems that he ought to refrain entirely from Communion can be compared to the Centurion, as stated above (A. 10, ad 3). Therefore, since we do not read of Christ entering his house, it seems to be lawful for any individual to abstain from Communion his whole life long.
Obj. 2: Further, it is lawful for anyone to refrain from what is not of necessity for salvation. But this sacrament is not of necessity for salvation, as was stated above (Q. 73, A. 3). Therefore it is permissible to abstain from Communion altogether.