John Gill Commentary Romans 7:16

"But if what I would not, that I do, I consent unto the law that it is good." — Romans 7:16 (ASV)

If then I do that which I would not
This is a corollary, or an inference from what he had related of his own experience; that since what he did, though it was contrary to the law of God, yet was what he did not will nor allow of, but hated, it must be a clear point, that he

consented to the law, that it was good ;
lovely and amiable; that it forbad those things which were hateful, and commanded those things which were desirable to a good man; and so is acknowledged to be a very beautiful rule of obedience, walk, and conversation.