Answer:
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
What's as small as a mouse but guards a house like a lion?
In many years, not much has happened. In many minutes, a lot has happened. In one second, everything has happened.
Though blind as well, can lead the blind well.
He has married many women but has never married.
The more of me you take, the more I appear behind you. What am I?