Institutes 2.8.10 — EXPOSITION OF THE MORAL LAW.
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**EXPOSITION OF THE MORAL LAW.**
But why did God thus deliver his commandments, as it were, by halves, using elliptical expressions with a larger meaning than that actually expressed? Other reasons are given, but the following seems to me the best:—As the flesh is always on the alert to extenuate the heinousness of sin (unless it is made, as it were, perceptible to the touch), and to cover it with specious pretexts, the Lord sets forth, by way of example, whatever is foulest and most iniquitous in each species of transgression, that the delivery of it might produce a shudder in the hearer, and impress his mind with a deeper abhorrence of sin. In forming an estimate of sins, we are often imposed upon by imagining that the more hidden the less heinous they are. This delusion the Lord dispels by accustoming us to refer the whole multitude of sins to particular heads, which admirably show how great a degree of heinousness there is in each. For example, wrath and hatred do not seem so very bad when they are designated by their own names; but when they are prohibited under the name of murder, we understand better how abominable they are in the sight of God, who puts them in the same class with that horrid crime. Influenced by his judgment, we accustom ourselves to judge more accurately of the heinousness of offences which previously seemed trivial.
Source
source-manifest/institutes— Calvin, Institutes of the Christian Religion, tr. Beveridge 1845 (PD)- evidence_grade: D_doctrinal_textbook