Two friends get into an argument while traveling through the desert and one slaps the other. The one who was slapped writes this in the sand. Later, at an oasis, the one who was slapped falls into the mire and begins drowning, but is saved by his friend. He then engraves what happened in a stone. When asked why he wrote in different mediums, he explains that hurts should be written in sand to be erased by forgiveness, but good deeds engraved in stone to last forever.