A necessary condition for justification is faith. Right? And faith involves an active embracing, and trusting in Christ-and in Christ alone. In that sense it involves some action of the will. It involves some step of embracing Christ. Now we’re not saying-Luther isn’t saying, Augustine isn’t saying-that the human will is not involved in salvation. When I have faith in Christ, I am the one who is trusting, I am the one who is believing, I am the one who is choosing him, and I am choosing him freely. That’s not an issue. We all agree on that. The question is, What has to happen before that person will choose Christ, will embrace Christ? When I say I have to embrace Christ in order to be saved-I have to have faith in order to be saved, I have to ask the next question: How do I get the faith? Can I choose to believe out of my dead, sinful nature?
read more How does the will function in salvation? – R.C. Sproul