A month later, the horse came home--this time bringing with her two beautiful wild horses. The neighbors became excited at the farmer's good fortune. Such lovely strong horses! The farmer said, "What makes you think this is good fortune?"
The farmer's son was thrown from one of the wild horses and broke his leg. All the neighbors were very distressed. Such bad luck! The farmer said, "What makes you think it is bad?"
A war came, and every able-bodied man was conscripted and sent into battle. Only the farmer's son, because he had a broken leg, remained. The neighbors congratulated the farmer. "What makes you think this is good?" said the farmer.
"Truly, one may gain by losing; And one may lose by gaining."
Dao De Ching #42