A.T. Robertson 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)

I consent unto the law (συνφημ τω νομω). Old verb, here only in N.T., with associative instrumental case. "I speak with." My wanting (θελω) to do the opposite of what I do proves my acceptance of God's law as good (καλος).