But sin, taking occasion by the commandment, worked in me all manner of covetousness. For without the law sin was dead.
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Ambrosiaster
AD 400
By “all kinds of covetousness” Paul means every sin. [In the last verse] he mentioned covetousness according to the law, and now by adding other sins he shows that all covetousness works in man by the impulse of the devil, whom he calls “sin,” so that the law was given to man to promote the opposite. For when the devil saw the help provided by the law for man, whom he was delighted to have snared as much by his own sin as by the sin of Adam, he realized that this was done against him. For when he saw man placed under the law he knew that he would escape from his control, for now man knew how to escape the punishment of hell. For this reason his wrath was kindled against man, in order to turn him away from the law and get him to do what was forbidden, so that he would again offend God and fall back into the devil’s power. “Apart from the law sin lies dead.” This is to be understood in two ways. First, you should realize that the devil is meant when the word sin is used and that it also refers here to sin itself. The devil is said to have died because before the law came he did not conspire to deceive man and was quiet, as if unable to possess him. But, second, “sin was also dead,” because it was thought that it would not be reckoned by God. For that reason it was dead as far as natural man was concerned, as if he could sin without being punished. In fact sin was not absent, as I have already indicated, but this was not realized until it became clear by the giving of the law, i.e., that sin would revive. But how could it revive unless it had previously been alive and after the fall of man was thought to be dead when in fact it was still living? People thought that sin was not being reckoned to them, when in fact it was. Thus something which was alive was assumed to be dead. Commentary on Paul’s Epistles.