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11. Be glad in Jehovah. After teaching how ready and accessible true happiness is to all the godly, David, with much reason, exhorts them to gladness. He commands them to rejoice in the Lord, as if he had said, There is nothing to prevent them from assuring themselves of God’s favor, seeing he so liberally and so kindly offers to be reconciled to them. In the meantime, we may observe that this is the incomparable fruit of faith which Paul likewise commends, namely, when the consciences of the godly being quiet and cheerful, enjoy peace and spiritual joy. Wherever faith is lively, this holy rejoicing will follow. But since the world’s own impiety prevents it from participating in this joy, David, therefore, addresses the righteous alone, whom he denominates the upright in heart, to teach us that the external appearance of righteousness which pleases men is of no avail in the sight of God. But how does he call those righteous, whose whole happiness consists in the free mercy of God not imputing their sins to them? I answer, that none others are received into favor but those who are dissatisfied with themselves for their sins, and repent with their whole heart; not that this repentance merits pardon, but because faith can never be separated from the spirit of regeneration. When they have begun to devote themselves to God, he accepts the upright disposition of their hearts equally as if it were pure and perfect; for faith not only reconciles a man to God, but also sanctifies whatever is imperfect in him, so that by the free grace of God, he becomes righteous who could never have obtained so great a blessing by any merit of his own.