Institutes 2.8.47 — EXPOSITION OF THE MORAL LAW.
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**EXPOSITION OF THE MORAL LAW.**
The purport of the commandment is, since God, who is truth, abhors falsehood, we must cultivate unfeigned truth towards each other. The sum, therefore, will be, that we must not by calumnies and false accusations injure our neighbour’s name, or by falsehood impair his fortunes; in fine, that we must not injure any one from petulance, or a love of evil-speaking. To this prohibition corresponds the command, that we must faithfully assist every one, as far as in us lies, in asserting the truth, for the maintenance of his good name and his estate. The Lord seems to have intended to explain the commandment in these words: “Thou shalt not raise a false report: put not thine hand with the wicked to be an unrighteous witness.” “Keep thee far from a false matter,” ( Exod. 23:1 , 7 ). In another passage, he not only prohibits that species of falsehood which consists in acting the part of tale-bearers among the people, but says, “Neither shalt thou stand against the blood of thy neighbour,” ( Lev. 19:16 ). Both transgressions are distinctly prohibited. Indeed, there can be no doubt, that as in the previous commandment he prohibited cruelty unchastity, and avarice, so here he prohibits falsehood, which consists of the two parts to which we have adverted. By malignant or vicious detraction, we sin against our neighbour’s good name: by lying, sometimes even by casting a slur upon him, we injure him in his estate. It makes no difference whether you suppose that formal and judicial testimony is here intended, or the ordinary testimony which is given in private conversation. For we must always recur to the consideration, that for each kind of transgression one species is set forth by way of example, that to it the others may be referred, and that the species chiefly selected, is that in which the turpitude of the transgression is most apparent. It seems proper, however, to extend it more generally to calumny and sinister insinuations by which our neighbours are unjustly aggrieved. For falsehood in a court of justice is always accompanied with perjury. But against perjury, in so far as it profanes and violates the name of God, there is a sufficient provision in the third commandment. Hence the legitimate observance of this precept consists in employing the tongue in the maintenance of truth, so as to promote both the good name and the prosperity of our neighbour. The equity of this is perfectly clear. For if a good name is more precious than riches, a man, in being robbed of his good name, is no less injured than if he were robbed of his goods; while, in the latter case, false testimony is sometimes not less injurious than rapine committed by the hand.
Source
source-manifest/institutes— Calvin, Institutes of the Christian Religion, tr. Beveridge 1845 (PD)- evidence_grade: D_doctrinal_textbook