In regard to the oblation, two things are done, namely, the people's praise in singing the "offertory," expressing the joy of the offerers, and the priest's prayer asking for the people's oblation to be made acceptable to God. Hence David said (1 Para 29:17): "In the simplicity of my heart, I have . . . offered all these things: and I have seen with great joy Thy people which are here present, offer Thee their offerings": and then he makes the following prayer: "O Lord God . . . keep . . . this will."
Then, regarding the consecration, performed by supernatural power, the people are first of all excited to devotion in the "Preface," hence they are admonished "to lift up their hearts to the Lord," and therefore when the "Preface" is ended the people devoutly praise Christ's Godhead, saying with the angels: "Holy, Holy, Holy"; and His humanity, saying with the children: "Blessed is he that cometh." In the next place the priest makes a "commemoration," first of those for whom this sacrifice is offered, namely, for the whole Church, and "for those set in high places" (1 Tim. 2:2), and, in a special manner, of them "who offer, or for whom the mass is offered." Secondly, he commemorates the saints, invoking their patronage for those mentioned above, when he says: "Communicating with, and honoring the memory," etc. Thirdly, he concludes the petition when he says: "Wherefore that this oblation," etc., in order that the oblation may be salutary to them for whom it is offered.
Then he comes to the consecration itself. Here he asks first of all for the effect of the consecration, when he says: "Which oblation do Thou, O God," etc. Secondly, he performs the consecration using our Saviour's words, when he says: "Who the day before," etc. Thirdly, he makes excuse for his presumption in obeying Christ's command, saying: "Wherefore, calling to mind," etc. Fourthly, he asks that the sacrifice accomplished may find favor with God, when he says: "Look down upon them with a propitious," etc. Fifthly, he begs for the effect of this sacrifice and sacrament, first for the partakers, saying: "We humbly beseech Thee"; then for the dead, who can no longer receive it, saying: "Be mindful also, O Lord," etc.; thirdly, for the priests themselves who offer, saying: "And to us sinners," etc.
Then follows the act of receiving the sacrament. First of all, the people are prepared for Communion; first, by the common prayer of the congregation, which is the Lord's Prayer, in which we ask for our daily bread to be given us; and also by private prayer, which the priest puts up specially for the people, when he says: "Deliver us, we beseech Thee, O Lord," etc. Secondly, the people are prepared by the "Pax" which is given with the words, "Lamb of God," etc., because this is the sacrament of unity and peace, as stated above (Q. 73, A. 4; Q. 79, A. 1). But in masses for the dead, in which the sacrifice is offered not for present peace, but for the repose of the dead, the "Pax" is omitted.
Then follows the reception of the sacrament, the priest receiving first, and afterwards giving it to others, because, as Dionysius says (Eccl. Hier. iii), he who gives Divine things to others, ought first to partake thereof himself.
Finally, the whole celebration of mass ends with the thanksgiving, the people rejoicing for having received the mystery (and this is the meaning of the singing after the Communion); and the priest returning thanks by prayer, as Christ, at the close of the supper with His disciples, "said a hymn" (Matt. 26:30).
Reply Obj. 1: The consecration is accomplished by Christ's words only; but the other words must be added to dispose the people for receiving it, as stated above.
Reply Obj. 2: As is stated in the last chapter of John (verse 25), our Lord said and did many things which are not written down by the Evangelists; and among them is the uplifting of His eyes to heaven at the supper; nevertheless the Roman Church had it by tradition from the apostles. For it seems reasonable that He Who lifted up His eyes to the Father in raising Lazarus to life, as related in John 11:41, and in the prayer which He made for the disciples (John 17:1), had more reason to do so in instituting this sacrament, as being of greater import.
The use of the word manducate instead of comedite makes no difference in the meaning, nor does the expression signify, especially since those words are no part of the form, as stated above (Q. 78, A. 1, ad 2, 4).
The additional word "all" is understood in the Gospels, although not expressed, because He had said (John 6:54): "Except you eat the flesh of the Son of Man . . . you shall not have life in you."