Romans 7:7
What shall we say then? Is the law of Moses sinful? Certainly not! For I would not have known what sin was if it had not been for the law. For [example]; I would not have known [what it meant] to covet [i.e., have a strong desire for what belongs to someone else] except that the law said [Ex. 20:17], "You must not covet."
Romans 7:13
Was this [commandment] then, which was intended for my good, [actually] responsible for my [spiritual] death? Certainly not! But so that sin could be seen as [truly] sinful, it produced [spiritual] death in me through something that was good [i.e., the commandment against sinning]. This was so that, by means of the commandment [against sinning], sin could be seen as extremely sinful.
Romans 8:7
This is because the one whose mind is [controlled] by the flesh is an enemy of God; for he is not obedient to God's law, and in fact, cannot obey it.