Daoist Meditation: The Purification of the Heart Method of Meditation and Discourse on Sitting and Forgetting (Zuo Wang Lun) by Si Ma. Master Cherng’s translation of Si Ma Cheng Zhen’s 8th-century classic text on meditation, Discourse on Sitting and Forgetting, is accompanied by an extensive explanatory commentary that is unique in its ability to make this complex text accessible to the Western reader. Master Cherng explains how to meditate using the Purification of the Heart method in the introduction to the text, and photographs clearly illustrate the proper postures. He deciphers Si Ma Cheng Zhen’s Chinese metaphors and abstract language to provide a clear explanation of the processes at work and the resulting changes to the mind, spirit, and body. His translation and accompanying commentary presents the classic text in an approachable and practical manner, providing Western students of Daoism and anyone interested in meditation with direct access to the text’s meaning in practice.