Thematic Bible: What is not vain

And Moses finished speaking all these words to all Israel: And he said unto them, Set your hearts unto all the words which I testify among you this day, which you shall command your children to observe to do, all the words of this law. For it is not a vain thing for you; because it is your life: and through this thing you shall prolong your days in the land, which you go over Jordan to possess.