The mercy of God understands our weakness, and meets us in our frailties; The sovereign magnificence of God fulfils his own purposes without adjustment or alternation – from beginning to end. In spite of all his excuses, Moses obeyed. God used him because he obeyed. Because the Lord is truly sovereign over all things, then the only reasonable response to his call on our lives is to trust him. It is his omnipotence that matters, not our incompetence.