One late autumn night, a young monk woke up crying.
The head monk asked him, "What's wrong? Did you have a nightmare?"
"No."
"Did you have a sad dream?"
"No," said the young monk, "I had a sweet dream."
The head monk asked, "Then why are you crying so sadly?"
The young monk wiped away his tears and quietly answered, "Because the dream I had can't come true."