If we are not personally engaged in God's great mission in the world, then we have missed the very thing he created us to do. We are like birds meant to fly but living in a cage; fish meant to swim but floundering on the beach. It makes sense when you think about it. If the Author of the universe created us to play a key role in his unfolding drama but we have failed to find our place in that story, then of course we would feel incomplete.