This is an ancient Buddhist story about non-attachment. In Buddhism, attachment (to your perception, to wants and agendas) is the key to unhappiness.
In China there once lived an old farmer and his son. They had a horse they used in plowing their rice fields. One day the horse ran away. The people in the village said, "That's terrible! How will you plow your fields?” The farmer said, “It’s neither good nor bad, it just is.”
Two weeks later the horse came bounding back out of the forest, bringing a wild horse with him. The villagers said, “That’s incredible! Just like that, you now have two horses!” The farmer said, “It’s neither good nor bad, it just is.”
The following day, the farmer’s son started training the wild horse to tame him. He fell off the horse and broke his leg. The people in the village said, “That’s awful, what are you going to do about all the farm work?” The farmer replied, “It’s neither good nor bad, it just is.”
A month later a war broke out, and the emperor’s men came to the village to draft soldiers. The farmer’s son was spared because of his injury. The villagers exclaimed, “That’s amazing! You are so lucky!” The farmer replied, “It’s neither good nor bad, it just is.”