Do you ask, “What is faith in him?” I answer, the leaving of your way, your objects, your self, and the taking of his and him; the leaving of your trust in men, in money, in opinion, in character, in atonement itself, and doing as he tells you. I can find no words strong enough to serve for the weight of this necessity – this obedience. It is the one terrible heresy of the church, that it has always been presenting something else than obedience as faith in Christ.

It is absurd to say you believe if you do not obey God.