Grateful

Over the years i've been trying to find a parable that best describe the situation of what we've been through..and of how grateful we were (and still are) cause things happened (even if it's bad) for a reason.

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There's a story about a farmer who finds a horse. Very happy he uses the horse to work on the farm and everyone in the village thinks that he's so lucky to have found a horse.

The next day, his son working with the horse falls from the horse and ends up losing his leg.
the whole village think, how bad that because of the horse the son lost a leg.

Then war starts and the army come to recruit all the sons to go to war, but since his son is missing a leg, he stays home instead of getting killed in the war.