An old Zen Story
A hermit was meditating by a river when a young man interrupted him. "Master, I wish to become your disciple," said the man. "Why?" replied the hermit. The young man thought for a moment. "Because I want to find the purpose of life."
The master jumped up, grabbed him by the scruff of his neck, dragged him into the river, and plunged his head underwater. After holding him there for a minute, with him kicking and struggling to free himself, the master finally pulled him up out of the river. The young man coughed up water and gasped to get his breath. When he eventually quieted down, the master spoke. "Tell me, what did you want most of all when you were underwater."
"To breathe!" answered the man.
"Very well," said the master. "That is the purpose of life. To live."