One day on the way there were two friends who were arguing, one of them slapped his best friend. The man feels pain, but the man is silent and writes on the sand: "Today my friend slapped me"
These two friends kept on going and found an oasis. They decided to swim in the spring and suddenly the slapped man had drowned, but his friend saved him. When he realized, he wrote on a rock: "Today my best friend saved my life."
Her friend also asked: When I hurt you, you wrote it in the sand and now when I save you you write it on the rock. Why?
He replied: When someone hurts us, we must write it on the sand, so that the wind can remove it. But when someone does something good for us, we must carve it on the rock, so the wind can not remove it.