A celebrated scholar traveled across the country to study under a famous Zen master. He arrived at the monastery and was immediately shown into the master's chamber. He sat down, confident and composed, and began to speak. He talked about his years of study, his published works, his theories on enlightenment, and his understanding of the ancient texts. He spoke for a long time. The master simply listened, then quietly rose and began to prepare tea. He placed a cup in front of the scholar and began to pour. The tea reached the brim and kept going, spilling over the cup and onto the table. The scholar jumped back. "Master, stop! The cup is overflowing!"
The master set down the pot and looked at him calmly. "You are like this cup," he said. "You arrive already full, full of what you know, full of who you think you are, full of the version of yourself you have worked so hard to build. I cannot teach a full cup. Before you can receive wisdom, you must first be willing to become empty." The scholar was silent for the first time, and in that silence something cracked open because he realized every question he had asked the master was not really a question at all. It was a performance, a way of showing what he already knew. His ego had dressed itself up as curiosity and called it learning. This is what ego does. It doesn't announce itself loudly. It whispers, "I already know this. I've heard this before. This doesn't apply to me." And just like that, the cup stays full, and nothing can enter.
The ancient teacher said, "The beginner's mind sees many possibilities. The expert's mind sees few." It doesn't matter how much you know. The moment you stop being empty, you stop being teachable, and the moment you stop being teachable, you stop growing. Empty the cup every single day. Start again.