Let the gentle bush dig its root deep and spread upward to split the boulder.
— Carl Sandburg

When a torrent sweeps a man against a boulder, you must expect him to scream, and you need not be surprised if the scream is sometimes a theory.
Robert Louis Stevenson boulders quote

In conversation the game is, to say something new with old words. And you shall observe a man of the people picking his way along, step by step, using every time an old boulder, yet never setting his foot on an old place.
— Ralph Waldo Emerson

What to do if you find yourself stuck in a crack in the ground underneath a giant boulder you can't move, with no hope of rescue. Consider how lucky you are that life has been good to you so far. Alternatively, if life hasn't been good to you so far, which given your current circumstances seems more likely, consider how lucky you are that it won't be troubling you much longer.
— Douglas Adams

At some point, you can't lift this boulder with just your own strength. And if you find that you need to move bigger and bigger boulders up hills, you will need more and more help.
— Vinton Cerf