He crowns those devoted to Him. So this psalm is seen rightly to have incorporated Alleluia in its heading, for it began with the Lord's praise and it likewise ends with His praise.
How splendidly has the most faithful people rejoiced! They brought joy to us as well in our hearing their joy, for our mental eagerness is enhanced when we drink in the sweet taste of another's joyful utterances. We must not think it idle that this delight of the faithful is set immediately after Psalm 109. Reflect on the sweetness and untroubled attitude of the singers, and you will discover here the image of that reward which the Lord promises to the labourers in the gospel, when He invited them to undertake toil in the vineyard through the gift of His summons. He himself is the denarius which is to be given to those who come early and late in the day. 20 He is the denarius because He bears the crown; He is the one denarius, because He shall have no end whatsoever. The beautiful perfection of the alphabet was added to this psalm so that instruction in the letters might be joined to the pleasure of such great joy.
I. Alleluia. Of the return of Aggaeus and Zacharias. Since the psalmist has already set down the bare Alleluia, let us examine what meaning is intended by these additional names. Aggaeus and Zacharias were prophets who prophesied after the transmigration from Babylon under king Darius, long after these verses were sung. When they returned to their native region of Jerusalem and saw the temple restored, 1 they poured forth the Lord's praises with great delight. To represent this, the present psalm as well as the previous one is seen to be interlaced with the letters of the entire alphabet as though with golden guiding-lines. The Christian is to sing this song with the most consummate joy after his sins are forgiven. Remember that this is the fourth psalm which instructs the faithful; it points out how great are