Reply Obj. 3: The Eucharist is the sacrament of the unity of the whole Church: and therefore in this sacrament, more than in the others, mention ought to be made of all that belongs to the salvation of the entire Church.
Reply Obj. 4: There is a twofold instruction in the Faith: the first is for those receiving it for the first time, that is to say, for catechumens, and such instruction is given in connection with Baptism. The other is the instruction of the faithful who take part in this sacrament; and such instruction is given in connection with this sacrament. Nevertheless catechumens and unbelievers are not excluded therefrom. Hence in De Consecr., dist. 1, it is laid down: "Let the bishop hinder no one from entering the church, and hearing the word of God, be they Gentiles, heretics, or Jews, until the mass of the Catechumens begins," in which the instruction regarding the Faith is contained.
Reply Obj. 5: Greater devotion is required in this sacrament than in the others, for the reason that the entire Christ is contained therein. Moreover, this sacrament requires a more general devotion, i.e. on the part of the whole people, since for them it is offered; and not merely on the part of the recipients, as in the other sacraments. Hence Cyprian observes (De Orat. Domin. 31), "The priest, in saying the Preface, disposes the souls of the brethren by saying, 'Lift up your hearts,' and when the people answer—'We have lifted them up to the Lord,' let them remember that they are to think of nothing else but God."
Reply Obj. 6: As was said above (ad 3), those things are mentioned in this sacrament which belong to the entire Church; and consequently some things which refer to the people are sung by the choir, and same of these words are all sung by the choir, as though inspiring the entire people with them; and there are other words which the priest begins and the people take up, the priest then acting as in the person of God; to show that the things they denote have come to the people through Divine revelation, such as faith and heavenly glory; and therefore the priest intones the "Creed" and the "Gloria in excelsis Deo." Other words are uttered by the ministers, such as the doctrine of the Old and New Testament, as a sign that this doctrine was announced to the peoples through ministers sent by God. And there are other words which the priest alone recites, namely, such as belong to his personal office, "that he may offer up gifts and prayers for the people" (Heb. 5:1). Some of these, however, he says aloud, namely, such as are common to priest and people alike, such as the "common prayers"; other words, however, belong to the priest alone, such as the oblation and the consecration; consequently, the prayers that are said in connection with these have to be said by the priest in secret. Nevertheless, in both he calls the people to attention by saying: "The Lord be with you," and he waits for them to assent by saying "Amen." And therefore before the secret prayers he says aloud, "The Lord be with you," and he concludes, "For ever and ever." Or the priest secretly pronounces some of the words as a token that regarding Christ's Passion the disciples acknowledged Him only in secret.
Reply Obj. 7: The efficacy of the sacramental words can be hindered by the priest's intention. Nor is there anything unbecoming in our asking of God for what we know He will do, just as Christ (John 17:1, 5) asked for His glorification.
But the priest does not seem to pray there for the consecration to be fulfilled, but that it may be fruitful in our regard, hence he says expressively: "That it may become to us the body and the blood." Again, the words preceding these have that meaning, when he says: "Vouchsafe to make this oblation blessed," i.e. according to Augustine (Paschasius, De Corp. et Sang. Dom. xii), "that we may receive a blessing," namely, through grace; "'enrolled,' i.e. that we may be enrolled in heaven; 'ratified,' i.e. that we may be incorporated in Christ; 'reasonable,' i.e. that we may be stripped of our animal sense; 'acceptable,' i.e. that we who in ourselves are displeasing, may, by its means, be made acceptable to His only Son."
Reply Obj. 8: Although this sacrament is of itself preferable to all ancient sacrifices, yet the sacrifices of the men of old were most acceptable to God on account of their devotion. Consequently the priest asks that this sacrifice may be accepted by God through the devotion of the offerers, just as the former sacrifices were accepted by Him.
Reply Obj. 9: The priest does not pray that the sacramental species may be borne up to heaven; nor that Christ's true body may be borne thither, for it does not cease to be there; but he offers this prayer for Christ's mystical body, which is signified in this sacrament, that the angel standing by at the Divine mysteries may present to God the prayers of both priest and people, according to Apoc. 8:4: "And the smoke of the incense of the prayers of the saints ascended up before God, from the hand of the angel." But God's "altar on high" means either the Church triumphant, unto which we pray to be translated, or else God Himself, in Whom we ask to share; because it is said of this altar (Ex. 20:26): "Thou shalt not go up by steps unto My altar, i.e. thou shalt make no steps towards the Trinity." Or else by the angel we are to understand Christ Himself, Who is the "Angel of great counsel" (Isa. 9:6: Septuagint), Who unites His mystical body with God the Father and the Church triumphant.
And from this the mass derives its name (missa); because the priest sends (mittit) his prayers up to God through the angel, as the people do through the priest, or else because Christ is the victim sent (missa) to us: accordingly the deacon on festival days "dismisses" the people at the end of the mass, by saying: "Ite, missa est," that is, the victim has been sent (missa est) to God through the angel, so that it may be accepted by God. _______________________
FIFTH ARTICLE [III, Q. 83, Art. 5]