Institutes 2.8.41 — EXPOSITION OF THE MORAL LAW.
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**EXPOSITION OF THE MORAL LAW.**
The purport of this commandment is, that as God loves chastity and purity, we ought to guard against all uncleanness. The substance of the commandment therefore is, that we must not defile ourselves with any impurity or libidinous excess. To this corresponds the affirmative, that we must regulate every part of our conduct chastely and continently. The thing expressly forbidden is adultery, to which lust naturally tends, that its filthiness (being of a grosser and more palpable form, in as much as it casts a stain even on the body) may dispose us to abominate every form of lust. As the law under which man was created was not to lead a life of solitude, but enjoy a help meet for him, and ever since he fell under the curse the necessity for this mode of life is increased; the Lord made the requisite provision for us in this respect by the institution of marriage, which, entered into under his authority, he has also sanctified with his blessing. Hence, it is evident, that any mode of cohabitation different from marriage is cursed in his sight, and that the conjugal relation was ordained as a necessary means of preventing us from giving way to unbridled lust. Let us beware, therefore, of yielding to indulgence, seeing we are assured that the curse of God lies on every man and woman cohabiting without marriage.
Source
source-manifest/institutes— Calvin, Institutes of the Christian Religion, tr. Beveridge 1845 (PD)- evidence_grade: D_doctrinal_textbook