Article — Slater, Manual of Moral Theology
Article I. The Necessity of the Eucharist
THE holy Eucharist can be received only materially by one who is not baptized and who consequently is incapable of receiving the other sacraments; it is received spiritually by one who ardently desires to receive it with the proper dispositions; it is received sacramentally when it is really received by one who has been baptized. The sacramental reception of the Eucharist is not a necessary means of salvation, for it is a sacrament of the living and supposes the grace of God in the soul, and a soul in the state of grace has everything which is necessary for salvation. Divines dispute whether the Eucharist is a necessary means for preserving the life of grace in the soul. It is, indeed, the ordinary food of the Christian soul, as bread is the ordinary food of the body, but as there is other spiritual food which may be taken, and notably prayer, and this may supply for the want of the ordinary food, the better opinion holds that the Eucharist is not strictly necessary even for the preservation of the life of grace in the soul. However, it is certainly necessary by divine and ecclesiastical precept. The divine precept is manifest from the words of our Lord: ‘‘ Unless you eat the flesh of the Son of man and drink his blood you shall not have life in you.”1 Not that these words imply that Communion under both kinds is of divine law, for he who receives the sacrament under one species receives the body and blood of Christ with his soul and divinity. Moreover, as the Council of Trent explains,2 he who made use of those words also said, ‘‘ He that eateth this bread shall live for ever.”3 The Church, therefore, for just and weighty reasons has forbidden Communion under both kinds, using the power given to her by Christ with reference to the dispensation of the sacraments, though she has no authority to change their substance.4
This divine precept must be fulfilled at least at the time of death, when it is of the greatest importance, and also sometimes during life. How often it must be received to satisfy the divine precept is uncertain, but the Church has determined the divine law by ordering all the faithful who have come to years of discretion to receive Holy Communion at least once a year, at Easter! Those, however, who desire to lead a good Catholic life, are by no means content with yearly Communion; they receive it once a month or still more frequently.
1 John vi 54.
3 John vi 59.
p. ii, 100–101
According to the general rule, children become subject to and bound to obey the positive laws of the Church when they reach the age of seven. However, before the new Code of Canon Law came into force it was usual to defer a child’s first Communion until he had reached the age of nine or twelve. The Code (Can. 859) interprets the phrase “‘ years of discretion,” used by the Lateran Council, to mean the same as to attain the use of reason, and so, now, children are bound to make their Easter Communion when they are seven years of age, unless, indeed, for some good reason it is judged advisable to abstain for a time. This obligation, as far as it affects those under the age of puberty, falls chiefly on those who have care of them—that is, on parents, guardians, confessors, teachers, and parish priests (Can. 860).
Canon 863 prescribes that the faithful are to be exhorted to receive Holy Communion frequently, and even daily, according to the rules laid down in the decrees of the Holy See, and that those who attend Mass should dispose themselves to receive Holy Communion not only spiritually, but sacramentally.
Daily Communion may not be refused to anyone who is in the state of grace and who has a right intention. There should be suitable preparation and thanksgiving, and that daily Communion may be practised with more prudence and with greater fruit, the advice of the confessor should be asked.
It is a disputed point whether one who is now in danger of death and who has within the last few days received Holy Communion is bound by divine precept to receive Viaticum. Although any good Catholic would certainly receive it again, yet the obligation to do so is not clear, because the previous Communion in all probability satisfies the divine law, . If one becomes dangerously ill on the day on which he has received Holy Communion out of devotion, it was similarly a disputed point whether he might, or was bound to, receive it again as Viaticum. Ordinarily, indeed, no one should receive Holy Communion twice on the same day, but in this case he may do so, though he is not bound to do so, for the Code only says that it is very much to be desired (Can. 864, sec. 2).
p. ii, 101–102
Holy Communion should not be given to those who have lost the use of reason, but if they have lucid intervals it may then be given if there be no danger of irreverence. To those who are in danger of death, and have lost the use of their senses, it may be given if they can swallow, and there is no danger of irreverence; and it should be given as Viaticum to criminals condemned to death if they are in the proper dispositions. Reverence forbids it to be given to those who are suffering from constant coughing, and to those who cannot retain any food on the stomach, unless they have been free from vomiting for six hours or so,
p. ii, 102