The Zen kong-an (koan, Jpn.), often a seemingly bizarre and unanswerable question, is a traditional teaching tool used by Zen masters to test their students' realization. This book presents the system of ten koans that Korean Zen Master Seung Sahn came to call the "Ten Gates." Each of these kong-ans is representative of the basic koan types a student will encounter during Zen training. Actual exchanges between Zen Master Seung Sahn and his students illuminate the "Ten Gates," and clearly demonstrate how koan practice is a skillful way to learn to trust in one's own wisdom and to manifest that wisdom in the koan-like situations of everyday life.