8. In the New Testament, likewise, Christ has made a promise or solemn vow, which we are to believe and thereto come to godliness and salvation. This promise is the word in which Christ says: "This is the cup of the New Testament." [Luke 22:20] This we shall now examine.
Not every vow is called a testament, but only a last irrevocable will of one who is about to die, whereby he bequeaths his goods, allotted and assigned to be distributed to whom he will. Just as St. Paul says to the Hebrews that a testament must be made operative by death, and avails nothing while he still lives who made the testament. [Heb. 9:16, 17] For other vows, made for this life, may be hindered or recalled, and hence are not called testaments. Therefore, wherever in Scripture God's testament is referred to by the prophets, in that very word the prophets are taught that God would become man and die and rise again, to the end that His Word, in which He promised such a testament, might be fulfilled and confirmed. For if He is to make a testament as He promised, then He must die; if He is to die, He must be a man. And so that little word "testament" is a short summary of all God's wonders and grace, fulfilled in Christ.
[Sidenote: Difference between Old and New Testaments]
9. He also distinguishes this testament from others and says, "It is a new and everlasting testament, in His own blood, for the forgiveness of sins"; whereby He disannuls the old testament. For the little word "new" makes the testament of Moses old and ineffective, one that avails no more. The old testament was a promise made through Moses to the people of Israel, to whom was promised the land of Canaan. For this testament God did not die, but the paschal lamb had to die instead of Christ and as a type of Christ; and so it was a temporal testament in the blood of the paschal lamb, which was shed for the obtaining and possessing of that land of Canaan. And as the paschal lamb, which died in the old testament for the land of Canaan, was a temporal and transitory thing, so too the old testament, together with that possession or land of Canaan allotted and promised therein, was temporal and transitory.
But Christ, the true Paschal Lamb, is an eternal divine Person, Who dies to establish the new testament; therefore the testament and the possessions therein bequeathed are eternal and abiding. And that is what He means when He contrasts this testament with that other, and says: A new testament—so that the other may become old and of none effect. An eternal testament, [Heb. 8:13] He says, not temporal like that other; not to dispose of temporal lands or possessions, but of eternal. In My blood, He says, not in the blood of a lamb. All this is to the end that the old should be altogether annulled and give place to the new alone.
[Sidenote: What is Promised in the Mass]
10. What then is this testament, and what is bequeathed us therein by Christ? Forsooth, a great, eternal and unspeakable treasure, namely, the forgiveness of all sins, as the words plainly state, "This is the cup of a new eternal testament in My blood, that is shed for you and for many for the remission of sin." [Matt. 26:8, Luke 22:30] As though He said: Behold, man, in these words I promise and bequeath thee forgiveness of all thy sin and eternal life. And in order that thou mayest be certain and know that such promise remains irrevocably thine, I will die for it, and will give My body and blood for it, and will leave them both to thee as sign and seal, that by them thou mayest remember Me." [1 Cor. 11:25] So He says: "As oft as ye do this, remember Me." [Luke 22:19] Even as a man who bequeathes something includes therein what shall be done for him afterward [1 Cor. 11:25], as is the custom at present in the requiems and masses for the dead, so also Christ has ordained a requiem for Himself in this testament; not that He needs it, but because it is necessary and profitable for us to remember Him; whereby we are strengthened in faith, confirmed in hope and made ardent in love. For as long as we live on earth our lot is such that the evil spirit and all the world assail us with joy and sorrow, to extinguish our love for Christ, to blot out our faith, and to weaken our hope. Wherefore we sorely need this sacrament, in which we may gain new strength when we have grown weak, and may daily exercise ourselves into the strengthening and uplifting of the spirit.
[Sidenote: Promises and Signs]
11. Furthermore, in all His promises God has usually given a sign in addition to the word, for the greater assurance and strengthening of our faith. Thus He gave Noah the sign of the rainbow. [Gen. 9:9, 13] To Abraham He gave circumcision as a sign. [Gen. 17:11] To Gideon He gave the rain on the ground and on the fleece [Judg. 6:37 ff.]; and we constantly find in the Scriptures many of these signs, given along with the promises. For so also worldly testaments are made; not only are the words written down, but seals and notaries' marks are affixed thereto, that they may always be binding and authentic. Thus Christ has done in this testament and has affixed to the words a powerful and most precious seal and sign; this is His own true body and blood under the bread and wine. For we poor men, since we live in our five senses, must always have, along with the words, at least one outward sign, on which we may lay hold, and around which we may gather; but in such wise that this sign may be a sacrament, that is, that it may be external and yet contain and express something spiritual, so that through the external we may be drawn into the spiritual, comprehending the external with the eyes of the body, the spiritual and inward with the eyes of the heart.
[Sidenote: The Parts of the Testament]