Michael: And you think you know better than my father? The one unimportant little man. What makes you think you get to choose?
Dean: Because I got to believe that I can choose what I do with my... unimportant little life.
Michael: You're wrong. You know how I know? Think of a million random acts of chance that let John and Mary be born, to meet, to fall in love, to have the two of you. Think of the million random choices that you make--and yet how each and everyone of them brings you closer to your destiny. Do you know why that is? Because it's not random. It's not chance. It's a plan that is playing itself out perfectly. Free will's an illusion, Dean. That's why you're going to say yes.