Book I · Chapter 24 — Lust and Shame Come from Sin; The Law of Sin; The

But if, in like manner, the question be asked of the concupiscence of the flesh, how it is that acts now bring shame which once were free from shame, will not her answer be, that she only began to have existence in men's members after sin? [XXII.] And, therefore, that the apostle designated her influence as "the law of sin," inasmuch as she subjugated man to herself when he was unwilling to remain subject to his God; and that it was she who made the first married pair ashamed at that moment when they covered their loins; even as all are still ashamed, and seek out secret retreats for cohabitation, and dare not have even the children, whom they have themselves thus begotten, to be witnesses of what they do. It was against this modesty of natural shame that the Cynic philosophers, in the error of their astonishing shamelessness, struggled so hard: they thought that the intercourse indeed of husband and wife, since it was lawful and honourable, should therefore be done in public. Such barefaced obscenity deserved to receive the name of dogs; and so they went by the title of "Cynics."

Chapter 25 [XXIII.]--Concupiscence in the Regenerate Without Consent is Not Sin; In What Sense Concupiscence is Called Sin.

Now this concupiscence, this law of sin which dwells in our members, to which the law of righteousness forbids allegiance, saying in the words of the apostle, "Let not sin, therefore, reign in your mortal body, that ye should obey it in the lusts thereof; neither yield ye your members as instruments of unrighteousness unto sin:" --this concupiscence, I say, which is cleansed only by the sacrament of regeneration, does undoubtedly, by means of natural birth, pass on the bond of sin to a man's posterity, unless they are themselves loosed from it by regeneration. In the case, however, of the regenerate, concupiscence is not itself sin any longer, whenever they do not consent to it for illicit works, and when the members are not applied by the presiding mind to perpetrate such deeds. So that, if what is enjoined in one passage, "Thou shalt not covet," is not kept, that at any rate is observed which is commanded in another place, "Thou shalt not go after thy concupiscences." Inasmuch, however, as by a certain manner of speech it is called sin, since it arose from sin, and, when it has the upper hand, produces sin, the guilt of it prevails in the natural man; but this guilt, by Christ's grace through the remission of all sins, is not suffered to prevail in the regenerate man, if he does not yield obedience to it whenever it urges him to the commission of evil. As arising from sin, it is, I say, called sin, although in the regenerate it is not actually sin; and it has this designation applied to it, just as speech which the tongue produces is itself called "tongue;" and just as the word "hand" is used in the sense of writing, which the hand produces. In the same way concupiscence is called sin, as producing sin when it conquers the will: so to cold and frost the epithet "sluggish" is given; not as arising from, but as productive of, sluggishness; benumbing us, in fact.