Answer:
In the night a mountain, in the morning a meadow.
It is greater than God and more evil than the devil. The poor have it, the rich need it, and if you eat it you'll die.
What goes through the door without pinching itself? What sits on the stove without burning itself? What sits on the table and is not ashamed?
Some live in me, some live on. And some shave me to stride upon. I rarely leave my native land. Until my death I always stand. High and low I may be found. Both above and below ground.
When young, I am sweet in the sun. When middle-aged, I make you gay. When old, I am valued more than ever.
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?