by jimwalton » Mon Jun 22, 2015 10:54 pm
It's true that we can contribute to it, but we can't control it. There are many factors at work—spiritual, circumstantial, and personal—that are part of our spiritual growth, temptations, progress and regress. While we can read more, study more, serve more, worship more fervently, sanctification is the work of God, though I would say that He responds with favor to our acts of faith and obedience. At the same time, we know that an increase in our pursuit of God sometimes means an increase in suffering, persecution, and spiritual attack. All in all, I still think that I cannot control the growth of my own sanctification. It's the work of God in me in conjunction with my response to him, and it's not a smooth path.
Consider the teachings of Paul, with which I am sure you are familiar:
"We always carry around in our body the death of Jesus so that the life of Jesus may also be revealed."
"We are hard-pressed on every side, but not crushed; perplexed, but not in despair; persecuted, but not abandoned; struck down, but not destroyed."
Often the path of progressive sanctification is trial by fire. We contribute by responding in a godly way, but the process of sanctification in us is God's. It's in that sense we can truly say, "In all things God works for the good of those who love him."