336. A Zen master's lineage is 'a special transmission outside the Scriptures'. For that which is transmitted passes from heart-mind to heart-mind, in the mutual recognition of master and disciple. And what passes from heart-mind to heart-mind is 'not dependent on words and letters'. Rather, it 'points directly to the heart-mind' that is transmitted. In this pointing, one 'sees into one's true nature', a 'nature that is no nature', and thus 'one's Buddhahood is realized'.