Римлянам 7:8

For without the law--that is, before its extensive demands and prohibitions come to operate upon our corrupt nature. sin was--rather, "is" dead--that is, the sinful principle of our nature lies so dormant, so torpid, that its virulence and power are unknown, and to our feeling it is as good as "dead."

We may observe in this chapter, I. Our freedom from the law further urged as an argument to press upon us sanctification (Rom 7:1-6). II. The excellency and usefulness of the law asserted and proved from the apostle's own experience, notwithstanding (Rom 7:7-14). III. A description of the conflict between grace and corruption in the heart (Rom 7:14, Rom 7:15, to the end).

7:8 sin used this command (literally sin took an opportunity through this command): The word opportunity is a military term for a position seized in enemy territory that becomes a base of operations (see 7:11). By expressing God’s demands, the commandments stimulate rebellion in sinful human beings. The commandments of God become an occasion for sin to accomplish its deadly purposes. • sin would not have that power: The law, by clearly expressing God’s will, makes people more accountable than they would be without it. The law of Moses did not solve Israel’s sin problem but exposed and exacerbated it. This is always the effect that God’s law, by itself, has on sinful human beings.