It's more complicated than that. When one is just starting the relationship , a response is made by a decision or choice. If Gods accepts the surrendered life , then you are drawn into the parable of the sower phase of the Salvation journey. If you one out of the four people that make it through the parable of the sower , then God seals His Spirit in us and the response has become is tempered by the Dunamus power of the Holy Spirit. At that point it's harder to get out of God will than it is to stay in it.
So at the start , a decision made with the will. Since we are surrendering our "life and will" to Him , if he deems our surrender genuine , we begin a path that regenerates a life thats more of Him , and less of us. So the more God takes us over , the more it would become a reaction to the Holy Spirit dwelling in us , and having the mind of Christ.
But back to my greater point. That if the initial surrender doesn't take place , the journey is stuck outside of God and His Word, until the right act of faithing takes place.