 Because they believe, and I believe, and I think you do too, there is no such thing as coincidence. God is either sovereign God in all things, or he's not God at all. So when you say good luck to somebody, it's a waste of your breath. There's no such thing as luck. There's no such thing as random or coincidence. No, he is sovereign God, and he always has been. He's the only thing that never changes.