Imagine if everything you valued was in a sack, hanging on the wall from one nail. It surely must be a strong nail, or you're lost! If life could all be boiled down to one thing or one word or one most important principle, what would it be? What is the irreducible minimum for everything and everyone? John answers that here, saying that Jesus Christ is the nail that everything hangs on. He determined what has been and what will be. Thus our knowledge of Him and relationship to Him is paramount above everything else.