Exposition on the Psalms of David
Second, when he says, "Because," he assigns the reason for joy and praise. The reason for praise and joy is twofold. One is on the part of God, in whom we are to exult. The second is on the part of his effects, at "By the word of the Lord." Concerning the first he does three things. First, he sets forth the reasons on God's part. And first, because "the word of the Lord is right," that is, his instruction: Ps. 118: "Your word is a lamp to my feet," and so on. Or, his very promise: Prov. 8: "All my words are just," and so on, "they are right to those who understand." Second, because "all his works are done in faithfulness," that is, they are faithful: Ps. 144: "The Lord is faithful in all his words and holy in all his works." Now there is great joy when a faithful man is found: Prov. 20: "A faithful man, who shall find?" Or, he says "in faith" because the works of God are good merits. But these are not meritorious unless they are done in faith, because without faith it is impossible to please God, Heb. 11. Or, "his word is right" and "his works." But for whom? "In faith," that is, in the faithful; for in the unfaithful the works and right words of God do not appear. Third, because he loves; and concerning this he does two things. First, he shows the affection of God when he says, "The Lord loves." Second, he manifests it through a sign, at "The earth is full of the mercy of the Lord." Among all the things that cause joy in the Lord, there are two: namely, mercy and justice: Prov. 20: "Mercy and truth preserve the king." For through justice subjects are defended. Take away justice, and no one will be secure and happy. Likewise, without mercy all fear and do not love. He gives us to understand this about God when he says, "The Lord loves mercy and judgment." He loves these in himself, because they are in his works: Ps. 24: "All the ways of the Lord are mercy and truth." Likewise, he loves these in each one: Mic. 6: "I will show you, O man, what is good and what the Lord requires of you," and so on. And therefore he says, "Exult," because God truly loves mercy, for "the earth is full of the mercy of the Lord." Behold, he manifests it through a sign. For all the fullness of the earth proceeds from the mercy of God, because the earth is full not of temporal goods but of spiritual goods, and especially after the coming of Christ. Acts 2: "They were all filled with the Holy Spirit," and so on. All these things are from the mercy of God: Rom. 9: "It is not of him who wills, nor of him who runs, but of God who shows mercy." He says "the earth," and so on, not heaven, because in heaven there is no misery, and therefore it does not need mercy; but the earth, where man is filled with many miseries, needs the fullness of mercy.
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