The Empty Cup: The usefulness of a cup is in its emptiness. — Bruce Lee

There was a Japanese Zen master named Nan-in who lived during the Meiji era . During his days as a teacher, he was visited by a university professor curious about Zen.

Being polite, Nan-in served the professor a cup of tea.

As he poured, the professor’s cup became full, but Nan-in kept on pouring. As the professor watched the cup overflow, he could no longer contain himself and said, “It is overfull. No more will go in!”

Nan-in turned to the professor and said, “Like the cup, you are too full of your own opinions and speculations. How can I show you Zen unless you first empty your cup?”