What does "empty the 'cup' of the mind" mean in the fifth paragraph?

Ao Qi, the founder and general manager of the famous "Creative Thinking" company in California, USA, told such an interesting story: A Zen master invited a disciple to drink tea. When the Zen master poured the tea, the tea cup was full. The Zen master continued to pour the tea, and the tea overflowed and splashed on the ground. The disciple couldn't help but said: "Master, you can't pour any more. The tea has overflowed and the cup can't hold it anymore!" The Zen master smiled and said: "You have good observation skills! If you accept my teachings, you must empty the cup of your mind." Come out." Ochi was inspired by this story. He said: "One of the keys to unlocking the shackles of the mind is to temporarily forget them and empty the cup of our mind." The overall meaning is that let us empty the cup of our mind so that we can accept more and better things. Wish 10 a fortune