EMPTY YOUR CUP!

The Zen master Nan-in received a visit from a university professor and offered him tea. When the tea reached the top of the cup,Nan-in just kept on pouring so that it spilled all over the table.

"Stop! Stop!" cried the professor. "It's too full!"

"And you," said Nan-in, "are too full of your own opinions. How can you learn Zen like that? Empty your cup!"