A university professor visits Nan-in, a Japanese Zen master. The professor says he wants to learn about Zen, but is filled with his own knowledge and opinions. Nan-in pours tea into his cup and does not stop so that it begins to overflow.
“ What are you doing? It is overfull. No more will go in!” yells the Professor. “Like this cup,” Nan-in said, “you are full of your own opinions and speculations. How can I show you Zen unless you first empty your cup?”
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