Thematic Bible: What is not vain

And Moses made an end of speaking all these words to all Israel. And he said to them, Set your hearts to all the words which I testify among you today, which you shall command your sons to observe and to do, all the words of this Law. For it is not a vain thing for you, because it is your life. And by this Word you shall prolong your days in the land where you go over Jordan, there to possess it.