Charlie Wilson's war quote

I love this quote from the movie "Charlie Wilson's war" (Charlie Wilson is not related to me) quote:
Its underlying philosophy is very true for many things in life.

When a boy in a village gets to ride a horse, the villagers say, "Oh how lucky is that boy"
But the Zen master says, "Well, we'll see."
The boy broke his leg after falling off the horse, the villagers say, "Oh, how terrible is that boy's fate!"
But the Zen master says, "Well, we'll see."
Many years later, the village is involved with a war, and all the men were made to go to join the battle, and the villagers say, "Oh how lucky is that boy"
But the Zen master says, "Well, we'll see."