The story is about a boy with a difficult character. His father gives him nails and tells him to hammer one into the fence each time he loses his temper. The first day he hammers 37 nails. Over time, as he learns to control himself, fewer nails are hammered each day. Eventually he is able to control his temper completely and removes all the nails. His father tells him that while the nails are gone, the holes they left in the fence will always remain, just as arguments leave wounds that don't fully heal. The passage concludes with advice about friendship, love, and life lessons.