No sinner has the right to say with impunity, 'God you owe me grace.' If grace is owed, it is not grace. The very essence of grace is its voluntary character. God reserves to himself the sovereign, absolute right to give grace to some and withhold that grace from others.
R. C. SproulIn Reformed theology, if God is not sovereign over the entire created order, then he is not sovereign at all. The term sovereignty too easily becomes a chimera. If God is not sovereign, then he is not God.
R. C. Sproul