A monk named Gherontie had a donkey and because he didn’t want to tire him out he never rode on him, he simply walked beside him all the way. When he wanted to change the gas cylinder he carried the empty one on his own back and walked before the donkey.
When the other monks asked him why he didn’t put the gas cylinder on the back of the donkey instead he answered: He will carry the refilled one. Why would I put the empty one on his back?
It was a funny sight but the old monk knew what he was doing because he had his own purpose…
From the Athonite Paterikon