Two friends were walking through the desert. During some point of the journey they had an argument and one friend slapped the other one in the face.
The one who got slapped was hurt, but without saying anything he stooped and wrote
in the sand, "Today my best friend slapped me in the face."
They kept on walking until they found an oasis, where they decided to take a bath. The one who had been slapped got stuck in the mire and started drowning but his friend saved him.
After he recovered from the near drowning, he wrote on a stone, "Today my best
friend saved my life."
The friend who had slapped and saved him asked, "After I hurt you, you wrote in
the sand but now you write on a stone. Why?"
His friend replied, "When someone hurts us we should write it down in sand, where winds of forgiveness can erase it away but when someone does something good for us we must engrave it in stone where no wind can ever erase it."