Among the people who lived close to the border, there was a man who led a righteous life. Without reason, his horse escaped, and fled into barbarian territory. Everyone pitied him, but the old man said : "what makes you think this is not a good thing?"
Several months later, his horse returned, accompanied by a superb barbarian stallion. Everyone congratulated him. But the old man said: "what makes you think this is cannot be a bad thing?"
The family was richer from a good horse, his son enjoyed riding it. He fell and broke his hip. Everyone pitied him, but the old man said: "what makes you think this is not a good thing!"
One year later, a large party of barbarians entered the border. All the valid men drew their bows and went to battle. From the people living around the border, nine out of ten died. But just because he was lame, the old man and his son were both spared.
Thence, good fortune turns into bad fortune, and bad fortune turns into good fortune. These changes never reach an end, their complexity can never be fathomed.
From Huainanzi via The China History Forum
"A Chinese story, kind of a Taoistic story about a farmer. One day, his horse ran away, and all the neighbors gathered in the evening and said 'that's too bad.' He said 'maybe.' Next day, the horse came back and brought with it seven wild horses. 'Wow!' they said, 'Aren't you lucky!' He said 'maybe.' The next day, his son grappled with one of these wild horses and tried to break it in, and he got thrown and broke his leg. And all the neighbors said 'oh, that's too bad that your son broke his leg.' He said, 'maybe.' The next day, the conscription officers came around, gathering young men for the army, and they rejected his son because he had a broken leg. And the visitors all came around and said 'Isn't that great! Your son got out.' He said, 'maybe.'"
Some Taoist texts