The story is about a boy who had a bad temper. His father gave him nails to hammer into a fence every time he lost his temper. Over weeks of controlling his anger, the number of nails hammered daily decreased. When he went one day without losing his temper, his father had him pull out nails each following day he remained calm. Eventually all the nails were removed, but the fence was left with holes, demonstrating that angry words leave lasting scars like physical wounds.