Thestorygoesthattwofriendswerewalkingthroughthedesert.Duringsomepointofthejourneytheyhadanargument,andonefriendslappedtheotheroneintheface.Theonewhogotslappedfelthurt,butwithoutsayinganything,wroteinthesand:"Todaymybestfriendslappedmeintheface."Theykeptonwalkinguntiltheyfoundanoasiswheretheydecidedtotakeabath.Theonewhohadbeenslappedgotstuckinthemireandstarteddrowning,butthefriendsavedhim.Afterherecoveredfromthenearlydrowning,hewroteonastone:"Todaymybestfriendsavedmylife."Thefriendwhohadslappedandsavedhisbestfriendaskedhim,"WhenIhurtyou,youwroteinthesandandnowyouwriteonastone.Why?"Theotherfriendreplied:"Whensomeonehurtsusweshouldwriteitdowninthesandwherewindsofforgivenesscaneraseitaway.Butwhensomeonedoessomethinggoodforus,wemustengraveitonstonewherenowindcanevereraseit."