What promises does David make to God, and what triumphs does he attribute to God?

David has made a few promises to God throughout the novel. He has promised to save Maria from the fire, and that he'd get to the woman in Denmark. He attributed both of these triumphs to God. "god certainly would not want that little girl, so like a flower and so beautiful to look at, to die. here, then, was something he could do for God in return!"