John Calvin 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)

But if what I do not desire, I do, I consent to the law, etc.; that is, “When my heart accepts the law and is delighted with its righteousness (which is certainly the case when it hates its transgression), it then perceives and acknowledges the goodness of the law, so that we are fully convinced—experience itself being our teacher—that no evil should be imputed to the law; indeed, that it would be beneficial to people, if it were to meet with upright and pure hearts.”

But this consent is not to be understood as the same as what we have heard exists in the ungodly, who have spoken words like these: “I see better things and approve of them; I follow the worse.” Again, “What is hurtful I follow; I avoid what I believe would be profitable.” For these act under a constraint when they subscribe to the righteousness of God, as their will is wholly alienated from it. In contrast, the godly person consents to the law with the real and most cheerful desire of their heart, for they wish nothing more than to mount up to heaven.