Navigate a forgotten classic poem and enrich your practice with famed Zen master Sekkei Harada. Three of the most pressing issues in any discussion of modern Zen are the true nature and function of Dharma transmission, how to appropriately practice with koans, and how to understand the "just sitting" of Soto Zen. Zen master Sekkei Harada uses the enigmatic "Ten Verses of Unfathomable Depth" as the basis of his practical and theoretical discussion of these concerns. Unfathomable Depths presents a concise treatment of Soto theory and practice, while delivering approachable and workable advice from one of Zen's most esteemed teachers. Rooting himself in Tong'an Changcha's classical poem, Harada intimately speaks to the world of Zen today.