Trapped

We are all prisoners of what we know. What we know can prevent us from learning new things.

Or said in a different way...

A young Samurai swordsman entered the house of a famous Zen master. He looked at the master, bowed and said, "Master! I have reached a deep level of Zen, both in theory and practice. I have heard you are great so I come here to bow to you and hope you can teach me something." The Zen master looked at this proud young man. Without a word, he went into the back room and brought out a teapot and a teacup. He placed the cup in front of the young man and started to pour the tea into the cup. The tea filled the cup quickly and soon began to overflow. The young man looked at the old man with a confused expression. He said, "Stop, master! The teacup is overflowing". The old Zen master put the teapot down and smiled at him. He said, "This is you. You are too full already. I cannot teach you. If you wish to learn, you must first empty your cup."