Basically, in the Old Testament there was a lot to keep track of.  There were a lot of things listed on what not to do.  If fact there were around 613 individual commandments in Old Testament, 365 negative ones and 248 positive ones.  Religion focuses on what we can’t do instead of what we can do.  Religious leaders were coming to Jesus hoping to trip Him up on things in the Law.  Pharisees didn’t stand a chance because it is hard to argue with the Guy that wrote the book.  Jesus turned the tables and boiled everything down to two Commandments.  If we keep these, we keep the whole Law.