The story is about a boy who has a difficult temper. His father gives him nails and tells him to hammer one into the fence each time he loses his patience. Over time, as the boy learns to control himself, he hammers fewer nails each day. Eventually he is able to remove all the nails, having learned self-control. His father then points out all the holes left in the fence from the nails, representing the lasting damage caused by hurtful words during arguments, even if apologies are given. The document then provides advice on friendship, life lessons, and encourages sharing the message.