2 But what did the Lord show written of Him in the Law of Moses, and the Prophets, and the Psalms? What did He show? Let Himself say. The evangelist has put this briefly, that we might know what in all that great compass of the Scriptures we ought to believe and to understand. Certainly there are many pages, and many books; the contents of them all is this which the Lord briefly spoke to His disciples. What is this? That “it behooved Christ to suffer, and to rise again the third day.”
You have it now concerning the Bridegroom, that “it behooved Christ to suffer, and to rise again:” the Bridegroom has been set forth to us. Concerning the Bride, let us see what He says; that you, when you know the Bridegroom and the Bride, may not without reason come to the marriage. For every celebration is a celebration of marriage: the Church's nuptials are celebrated. The King's Son is about to marry a wife, and that King's Son is Himself a King: and the guests frequenting the marriage are themselves the Bride.
Not, as in a carnal marriage, some are guests, and another is she that is married; in the Church they that come as guests, if they come to good purpose, become the Bride. For all the Church is Christ's Bride, of which the beginning and first fruits is the flesh of Christ: there was the Bride joined to the Bridegroom in the flesh. With good reason when He would betoken that same flesh, He broke bread, and with good reason “in the breaking of bread,” the eyes “of the disciples were opened, and they knew Him.”
Well then, what did the Lord say was written of Him in the Law and Prophets and Psalms? That “it behooved Christ to suffer.” Had He not added, “and to rise again,” well might those mourn whose eyes were holden; but “to rise again” is also foretold. And wherefore this? Why did it behoove Christ to suffer and to rise again? Because of that Psalm which we especially commended to your attention on the fourth day, the first station, of last week. Why did it behoove Christ to suffer and to rise again?
For this reason: “All the ends of the earth shall be reminded and converted unto the Lord, and all the kindreds of the nations shall worship before Him.” For that you may know that it behooved Christ to suffer and to rise again; in this place also what has He added, that after setting forth the Bridegroom He might also set forth the Bride? “And that there be preached,” says He, “in His name, repentance and remission of sins throughout all nations, beginning at Jerusalem.” You have heard, brethren; hold it fast.
Let no man doubt concerning the Church, that it is “throughout all nations:” let no man doubt that it began at Jerusalem, and has filled all nations. We know the field where the Vine is planted: but when it is grown we know it not, because it has taken up the whole. Whence did it begin? “At Jerusalem.” Whither has it come? To “all nations.” A few remain: it shall possess all. In the mean time, while it is taking possession of all, it has seemed good to the Husbandman to cut off some unprofitable branches, and they have made heresies and schisms.
Let not the branches that are cut off induce you to be cut off: rather exhort them that are cut off that they be grafted in again. It is manifest that Christ has suffered, is risen again, and is ascended into heaven: made manifest also is the Church, because there is “preached in His name repentance and remission of sins throughout all nations.” Whence did it begin? “Beginning at Jerusalem.” The man hears this; foolish and vain, and (how, shall I express it?) worse than blind! so great a mountain, and he does not see it; a candle set upon a candlestick, and he shuts his eyes against it!
Source: Homilies on the First Epistle of John (New Advent)