The heart represents the doctrine of love, the idea that we are here, in this world, to participate in our own creation. God is giving each of us the opportunity to become our own person. This is the reason that we are born unformed, unknowing, and utterly self-centered, and we are called to grow. We are called to grow in the faith that inspires the love which makes us more like God, and prepares us to share God's life as richly as we might.
We know that this is true because we cannot imagine that we are here for nothing. Rather, we know that we are here for something important, and what is more important than love?
When we believe that love is the way to heaven, we are freed to do it. We are freed from what would otherwise stop us-the fear that I would be the only one. This gives us:
Freedom to live the only life that can bring us happiness. After all, God is smart; He did not make us so that we can be happy unless we are going in the right direction.
Control. Because we can always do what we want most.