Moses' law did something unique in human history. You see the law given at Mount Sinai is simply, the codification of the law in the heart of every human being. By codifying it, God freezes it in time, thereby preserving the work he started from before the days at Eden; a work which he continues with every human tribe, but codified here with this desert people we call the Hebrews. He preserves it like one preserves meat by salting it. But why did God freeze-dry his project within the law?.Good question.