The law of giving and receiving is fundamental, and relates just as much to God as it does to us. As we go through the door of giving ourselves to God in worship we find that God comes through that same door and gives Himself to us. God's insistence that we worship Him is not really a demand at all but an offer-an offer to share Himself with us. When God asks us to worship Him, He is asking us to fulfill the deepest longing in Himself, which is His passionate desire to give Himself to us. It is what Martin Luther called "the joyful exchange."