Answer:
What is that which, though black itself, enlightens the world without burning?
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What is it?
Walk on the living, they don’t even mumble. Walk on the dead, they mutter and grumble
Forward I’m heavy, but backwards I’m not.
You seek it out, when your hunger is ripe. It sits on four legs, and smokes a pipe.
If I say "everything I tell you is a lie", am I telling you the truth or a lie?