A university professor went to visit a famous Zen(禅) master. While the master quietly served tea, the professor talked about Zen. The master poured the visitor’s cup to the brim(边), and then kept pouring. The professor watched the overflowing cup until he could no longer restrain(控制) himself. “It’s overfull! No more will go in!” the professor blurted(脱口而出). “You are like this cup,” the master replied, “How can I show you Zen unless you first empty your cup?”