
A university professor went to visit a famous Zen master named Nan-in to inquire about Zen. As the professor spoke, it became clear he was more interested in showing off his own knowledge than in listening. He lectured at length about his theories and opinions. Nan-in served tea. He poured his visitor's cup full, and then kept on pouring. The professor watched the tea overflow until he could no longer restrain himself. 'It is overfull. No more will go in!' he exclaimed. 'Like this cup,' Nan-in replied, 'you are full of your own opinions and speculations. How can I show you Zen unless you first empty your cup?'
To acquire new wisdom and learn effectively, one must first set aside preconceived notions, ego, and existing biases.
The moral is that an open and humble mind is necessary for learning. If you are already full of your own opinions, there is no room for new information or wisdom to enter.
The master is Nan-in, a Japanese Zen master who lived during the Meiji era (1868–1912). He was known for his direct and unconventional teaching methods.
The overflowing tea symbolizes the professor's mind, which is so crowded with his own theories, ego, and academic knowledge that he cannot absorb anything new from the master.
Shoshin, or 'beginner’s mind,' is the Zen practice of approaching subjects with lack of prejudice and openness, exactly what the professor lacked in this story.
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