Master Cherng's translation of Discourse on Sitting and Forgetting, an 8th century classic text on meditation by Si Ma Cheng Zhen, is accompanied by his extensive explanatory commentary, unique in its ability to make this complex text accessible to the Western reader. In the introduction to the text, Master Cherng explains how to practice the Purification of the Heart method of meditation and photographs clearly illustrate the correct postures. He deciphers the Chinese metaphors and abstract language of Si Ma Cheng Zhen to give a clear explanation of the processes involved and the resulting...