In this video, John Piper explains why the Doctrines of Grace have so impacted his life and ministry. While he doesn't go so far as explain these doctrines, he does show how they have sustained, catapulted, and given vision for his life and ministry. As you watch this, don't simply dismiss what he has to say simply because of words like "Calvinism" or other stereotypes you may have heard before. Listen. Investigate. Understand.
I agree with Piper in this regard. There is no way I could live or function as a pastor or Christian man if I didn't think God didn't have ultimate authority in all things . . . including salvation.