This translation includes commentary from major Chinese and Japanese historical sources. Zen Buddhism is often said to be a practice of mind-to-mind transmission'' without reliance on texts - in fact, some great teachers forbid their students to read or write. But Buddhism has also inspired some of the greatest philosophical writings of any religion and two such works lie at the center of Zen: The Heart Sutra, which monks recite all over the world, and The Diamond Sutra, said to contain answers to all questions of delusion and dualism.''