A nice reminder…
Scholar Tokusan, who was full full of knowledge and opinions about the dharma, came to Ryutan and asked about Zen. At one point Ryutan re-filled his guests teacup, but did not stop pouring when the cup was full. Tea spilled out and ran over the table. “Stop! The cup is full!” said Tokusan.
“Exactly,” said Master Ryutan. “You are like this cup; you are full of ideas. You come and ask for teaching, but your cup is full; I cant put anything in. Before I can teach you, youll have to empty your cup.”
via Empty Your Cup.