2 The field of the Lord is the world, not Africa. It is not with the Lord's field, as it is without these fields of ours, where Getulia bears sixty or an hundred fold, Numidia only ten fold: everywhere fruit is borne to Him, both an hundred fold, and sixty fold, and thirty fold: only do thou choose what you will be, if you think to belong to the Lord's Cross. “The Church” then “of the saints” is the Catholic Church. The Church of the saints is not the Church of heretics. The Church of the saints is that which God first prefigured before it was seen, and then set forth that it might be seen. The Church of the saints was heretofore in writings, now it is in nations: the Church of the saints was heretofore only read of, now it is both read of and seen. When it was only read of, it was believed; now it is seen, and is spoken against. His praise is in the “children of the kingdom,” that is, “the Church of the saints.”
3. “Let Israel rejoice in Him who made Him”. What is, “Israel”? “Seeing God.” He who sees God, rejoices in Him by whom he was made. What is it then, brethren? We have said that we belong to the Church of the saints: do we already see God? And how are we Israel, if we see not? There is one kind of sight belonging to this present time; there will be another belonging to the time hereafter: the sight which now is, is by faith; the sight which is to be will be in reality. If we believe, we see; if we love, we see: see what? God. Ask John: “God is love;” let us bless His holy Name, and rejoice in God by rejoicing in love. Whoso has love, why send we him afar to see God? Let him regard his own conscience, and there he sees God....“And let the sons of Sion exult in their King.” The sons of the Church are Israel. For Sion indeed was one city, which fell: amid its ruins certain saints dwelt after the flesh: but the true Sion, the true Jerusalem (for Sion and Jerusalem are one), is “eternal in the heavens,” and is “our mother.” She it is that has given us birth, she is the Church of the saints, she has nourished us, she, who is in part a pilgrim, in part abiding in the heavens. In the part which abides in heaven is the bliss of angels, in the part which wanders in this world is the hope of the righteous. Of the former is said, “Glory to God in the highest;” of the latter, “and on earth peace to men of good will.” Let those then who, being in this life, groan, and long for their country, run by love, not by bodily feet; let them seek not ships but wings, let them lay hold on the two wings of love. What are the two wings of love? The love of God, and of our neighbour. For now we are pilgrims, we sigh, we groan. There has come to us a letter from our country: we read it to you. “And the sons of Sion shall exult in their King.” The Son of God, who made us, was made one of us: and He rules us as our King, because He is our Creator, who made us. But He by whom we were made is the same as He by whom we are ruled, and we are Christians because He is Christ. He is called Christ from Chrism, that is, Anointing....Give to the Priest somewhat to offer. What could man find which he could give as a clean victim? What victim? What clean thing can a sinner offer? O unrighteous, O sinful man, whatever you offer is unclean, and somewhat that is clean must be offered for you....Let then the Priest that is clean offer Himself, and cleanse you. This is what Christ did. He found in man nothing clean for Him to offer for man: He offered Himself as a clean Victim. Happy Victim, true Victim, spotless Offering. He offered not then what we gave Him; yea rather, He offered what He took of us, and offered it clean. For of us He took flesh, and this He offered. But where took He it? In the womb of the Virgin Mary, that He might offer it clean for us unclean. He is our King, He is our Priest, in Him let us rejoice.
4. “Let them praise His Name in chorus”. What means “chorus”? Many know what a “chorus” is: nay, as we are speaking in a town, almost all know. A “chorus” is the union of singers. If we sing “in chorus,” let us sing in concord. If any one's voice is out of harmony in a chorus of singers, it offends the ear, and throwes the chorus into confusion. If the voice of one echoing discordantly troubles the harmony of them who sing, how does the discord of heresy throw into confusion the harmony of them who praise. The whole world is now the chorus of Christ. The chorus of Christ sounds harmoniously from east to west. “Let them sing a psalm unto Him with timbrel and psaltery.” Wherefore takes he to him the “timbrel and psaltery”? That not the voice alone may praise, but the works too. When timbrel and psaltery are taken, the hands harmonize with the voice. So too do thou, whenever you sing, “Halleluia,” deal forth your bread to the hungry, clothe the naked, take in the stranger: then does not only your voice sound, but your hand sounds in harmony with it, for your deeds agree with your words. You have taken to you an instrument, and your fingers agree with your tongue. Nor must we keep back the mystical meaning of the “timbrel and psaltery.” On the timbrel leather is stretched, on the psaltery gut is stretched; on either instrument the flesh is crucified. How well did he “sing a psalm on timbrel and psaltery,” who said, “the world is crucified unto me, and I unto the world”? This psaltery or timbrel He wishes you to take up, who loves a new song, who teaches you, saying to you, “Whosoever wills to be My disciple, let him deny himself, and take up his cross, and follow Me.” Let him not set down his psaltery, let him not set down his timbrel, let him stretch himself out on the wood, and be dried from the lust of the flesh. The more the strings are stretched, the more sharply do they sound. The Apostle Paul then, in order that his psaltery might sound sharply, what said he? “Stretching forth unto those things which are before,” etc. He stretched himself: Christ touched him; and the sweetness of truth sounded.
5. “For the Lord has dealt kindly among His people”. What dealing so kindly, as to die for the ungodly? What dealing so kindly, as with righteous Blood to blot out the handwriting against the sinner? What dealing so kindly, as to say, “I regard not what you were, be ye now what you were not”? He deals kindly in converting him that was turned away, in aiding him that is fighting, in crowning the conqueror. “And the meek He shall lift up in salvation.” For the proud too are lifted up, but not in salvation: the meek are lifted in salvation, the proud in death: that is, the proud lift up themselves, and God humbles them: the meek humble themselves, and God lifts them up.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)