Geoffrey Shugen Arnold, Roshi - ZMM - 6/2/24 - From the Book of Serenity, Case 19 - Yunmen's "Sumaru" - Koan practice guides us to something different than conceptual knowledge, a liberation of mind which is, as the Buddha said, subtle and difficult to understand. And yet, conceptual knowledge is an integral part of how we can realize the non-conceptual mind. Using Yunmen’s teachings, Shugen Roshi explores how calming the mind, and gaining insight, are important steps toward understanding how to truly free ourselves from conceptual thought and grasping at self-centered views.