Just as the Old Testament is a book in which are written God's laws and commandments, together with the history of those who kept and of those who did not keep them, so the New Testament is a book in which are written the gospel and the promises of God, together with the history of those who believe and of those who do not believe them.
For “gospel” [Euangelium] is a Greek word and means in Greek a good message, good tidings, good news, a good report, which one sings and tells with gladness. For example, when David overcame the great Goliath, there came among the Jewish people the good report and encouraging news that their terrible enemy had been struck down and that they had been rescued and given joy and peace; and they sang and danced and were glad for it [I Sam. 18:6].
Thus this gospel of God or New Testament is a good story and report, sounded forth into all the world by the apostles, telling of a true David who strove with sin, death, and the devil, and overcame them, and thereby rescued all those who were captive in sin, afflicted with death, and overpowered by the devil. Without any merit of their own He made them righteous, gave them life, and saved them, so that they were given peace and brought back to God. For this they sing, and thank and praise God, and are glad forever, if only they believe firmly and remain steadfast in faith.
This report and encouraging tidings, or evangelical and divine news, is also called a New Testament. For it is a testament when a dying man bequeaths his property, after his death, to his legally defined heirs. And Christ, before His death, commanded and ordained that His gospel be preached after His death in all the world [Luke 24:44-47]. Thereby He gave to all who believe, as their possession, everything that He had. This included: His life, in which He swallowed up death; His righteousness, by which He blotted out sin; and His salvation, with which He overcame everlasting damnation. A poor man, dead in sin and consigned to hell, can hear nothing more comforting than this precious and tender message about Christ; from the bottom of his heart he must laugh and be glad over it, if he believes it true.
Now to strengthen this faith, God has promised this gospel and testament in many ways, by the prophets in the Old Testament, as St. Paul says in Rom, I [:1], “I am set apart to preach the gospel of God which He promised beforehand through His prophets in the holy Scriptures, concerning His Son, who was descended from David,” etc.
To mention some of these places: God gave the first promise when He said to the serpent, in Gen. 3 [:15], “I will put enmity between you and the woman, and between your seed and her seed; he shall bruise your head, and you shall bruise his heel.” Christ is this woman's seed, who has bruised the devil's head, that is, sin, death, hell, and all his power. For without this seed, no man can escape sin, death, or hell.
Again, in Gen. 22 [:18], God promised Abraham, “Through your descendant shall all the nations of the earth be blessed.” Christ is that descendant of Abraham, says St. Paul in Gal. 3 [:16]; He has blessed all the world, through the gospel [Gal. 3:8]. For where Christ is not, there is still the curse that fell upon Adam and his children when he had sinned, so that they all are necessarily guilty and subject to sin, death, and hell. Over against this curse, the gospel now blesses all the world by publicly announcing, “Whoever believes in this descendant of Abraham shall be blessed.” That is, he shall be rid of sin, death, and hell, and shall remain righteous, alive, and saved forever, as Christ Himself says in John II [:26], “Whoever believes in me shall never die.”
Again God made this promise to David in 2 Sam. 7 [:12-14] when He said, “I will raise up your son after you, who shall build a house for my name, and I will establish the throne of his kingdom forever. I will be his father, and he shall be my son,” etc. This is the kingdom of Christ, of which the gospel speaks: an everlasting kingdom, a kingdom of life, salvation, and righteousness, where all those who believe enter in from out of the prison of sin and death.
There are many more such promises of the gospel in the other prophets as well, for example Mic. 5 [:2], “But you, O Bethlehem Ephrathah, who are little to be among the clans of Judah, from you shall come forth for me one who is to be ruler in Israel”; and again, Hos. 13 [:14], “I shall ransom them from the power of hell and redeem them from death. O death, I will be your plague; O hell, I will be your destruction.”
The gospel, then, is nothing but the preaching about Christ, Son of God and of David, true God and man, who by His death and resurrection has overcome for us the sin, death, and hell of all men who believe in Him. Thus the gospel can be either a brief or a lengthy message; one person can write of it briefly, another at length. He writes of it at length, who writes about many words and works of Christ, as do the four evangelists. He writes of it briefly, however, who does not tell of Christ's works, but indicates briefly how by His death and resurrection He has overcome sin, death, and hell for those who believe in Him, as do St. Peter and St. Paul.
See to it, therefore, that you do not make a Moses out of Christ, or a book of laws and doctrines out of the gospel, as has been done heretofore and as certain prefaces put it, even those of St. Jerome. For the gospel does not expressly demand works of our own by which we become righteous and arc saved; indeed it condemns such works. Rather the gospel demands faith in Christ: that He has overcome for us sin, death, and hell, and thus gives us righteousness, life, and salvation not through our works, but through His own works, death, and suffering, in order that we may avail ourselves of His death and victory as though we had done it ourselves.
To be sure, Christ in the gospel, and St. Peter and St. Paul besides, do give many commandments and doctrines, and expound the law. But these are to be counted like all Christ's other works and good deeds. To know His works and the things that happened to Him is not yet to know the true gospel, for you do not yet thereby know that He has overcome sin, death, and the devil. So, too, it is not yet knowledge of the gospel when you know these doctrines and commandments, but only when the voice comes that says, “Christ is your own, with His life, teaching, works, death, resurrection, and all that He is, has, does, and can do.”
Thus we see also that He does not compel us but invites us kindly and says, “Blessed are the poor,” etc. [Matt. 5:3]. And the apostles use the words, “I exhort,” “I entreat,” “I beg,” so that one sees on every hand that the gospel is not a book of law, but really a preaching of the benefits of Christ, shown to us and given to us for our own possession, if we believe. But Moses, in his books, drives, compels, threatens, strikes, and rebukes terribly, for he is a lawgiver and driver.
Hence it comes that to a believer no law is given by which he becomes righteous before God, as St. Paul says in I Tim. I [:9], because he is alive and righteous and saved by faith, and he needs nothing further except to prove his faith by works. Truly, if faith is there, he cannot hold back; he proves himself, breaks out into good works, confesses and teaches this gospel before the people, and stakes his life on it. Everything that he lives and does is directed to his neighbor's profit, in order to help him - not only to the attainment of this grace, but also in body, property, and honor. Seeing that Christ has done this for him, he thus follows Christ's example.
That is what Christ meant when at the last He gave no other commandment than love, by which men were to know who were His disciples [John 13:34-35] and true believers. For where works and love do not break forth, there faith is not right, the gospel does not yet take hold, and Christ is not rightly known. See, then, that you so approach the books of the New Testament as to learn to read them in this way.
Which are the true and noblest books of the New Testament? From all this you can now judge all the books and decide among them which are the best. John's Gospel and St. Paul's epistles, especially that to the Romans, and St. Peter's first epistle are the true kernel and marrow of all the books. They ought properly to be the foremost books, and it would be advisable for every Christian to read them first and most, and by daily reading to make them as much his own as his daily bread. For in them you do not find many works and miracles of Christ described, but you do find depicted in masterly fashion how faith in Christ overcomes sin, death, and hell, and gives life, righteousness, and salvation. This is the real nature of the gospel, as you have heard.
If I had to do without one or the other - either the works or the preaching of Christ - I would rather do without the works than without His preaching. For the works do not help me, but His words give life, as He Himself says [John 6:63]. Now John writes very little about the works of Christ, but very much about His preaching, while the other evangelists write much about His works and little about His preaching. Therefore John's Gospel is the one, fine, true, and chief gospel, and is far, far to be preferred over the other three and placed high above them. So, too, the epistles of St. Paul and St. Peter far surpass the other three Gospels, Matthew, Mark, and Luke.
In a word St. John's Gospel and his first epistle, St. Paul's epistles, especially Romans, Galatians, and Ephesians, and St. Peter's first epistle are the books that show you Christ and teach you all that is necessary and salvatory for you to know, even if you were never to see or hear any other book or doctrine. Therefore St. James' epistle is really an epistle of straw, compared to these others, for it has nothing of the nature of the gospel about it. But more of this in the other prefaces.