Book excerpt: Penetrate the nature of mind with this contemporary Korean take on a classic of Zen literature. The message of the Tang-dynasty Zen text in this volume seems simple: to gain enlightenment, stop thinking there is something you need to practice. For the Chinese master Huangbo Xiyun (d. 850), the mind is enlightenment itself if we can only let go of our normal way of thinking. The celebrated translation of this work by John Blofeld, The Zen Teaching of Huang Po, introduced countless readers to Zen over the last sixty years. Huangbo’s work is also a favorite of contemporary Zen (Korean: Seon) Master Subul, who has revolutionized the strict monastic practice of koans and adapted it for lay meditators in Korea and around the world to make swift progress in intense but informal retreats. Devoting themselves to enigmatic questions with their whole bodies, retreatants are frustrated in their search for answers and arrive thereby at a breakthrough experience of their own buddha nature. A Bird in Flight Leaves No Trace is a bracing call for the practitioner to let go and thinking and unlock the buddha within.