"Do you know who I am?" That's a common phrase from books and movies, when someone is trying to exert authority over someone else. In our Old Testament and Gospel readings tomorrow, we hear something similar. In Job 38, God speaks to Job, telling him who He is. In Mark 4, the Disciples ask, "who is this, that even the wind and sea obey Him?" after Jesus calms the storm. So who is God, and what has He done for us?