Answer:
I pass before the sun, but make no shadow.
A blind man enters a maze, and the entrance closes behind him. His only way out is to solve the maze. A long time passes, and he exits the maze through the correct exit. How did he solve the maze?
What comes once in a minute, twice in a moment, but never in a thousand years?
What is it which builds things up? Lays mountains low? Dries up lakes, and makes things grow? Cares not a whim about your passing? And is like few other things, because it is everlasting?
What can you share and still have all for yourself?
What did the piece of wood say when he saw the screwdriver and screws approaching?