To “empty one’s cup” is a Zen philosophy phrase which means to get rid of preconceived ideas about what you think the martial art of Wing Tsun will be and move aside ideas that you have gained from another martial art. If your head is full of fixed ideas about other martial arts, you will have to “empty your cup” while you learn this new set of concepts. Only in this way can you learn it and appreciate the differences and what it will mean to you and your training. If you would like to study with us and you come from another martial art, particularly if it is from a different lineage of Yip Man or a different version of Wing Chun, you will have to empty your cup.

Reference:  http://bengtwendel.com/your-teacup-is-full-empty-your-cup/

Sifu Keith Sonnenberg