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.
“Be not entangled in this world of days and nights; Thou hast another time and space as well.”
“The North African mule talks always of his mother's brother, the horse, but never of his father, the donkey, in favor of others supposedly more reputable.”