These four lines as describing the principles of Zen teaching as distinguished from other schools of Buddhism already in existence in China were formulated later and not by Dharma himself. We cannot exactly tell who was the real author, as we have no definite information on this subject. One historian, Tsung-chien,[4.20] who compiled from the T‘ien-tai point of view a Buddhist history entitled _The Rightful Lineage of the Śākya Doctrine_ in 1237, ascribes it to Nansen Fu-gwan[4.21]; probably the formula originated in those days when Baso (Ma-tsu), Hyakjo (Pai-chang), Obaku (Huang-po), Sekito (Shih-tou) and Yakusan (Yüeh-shan)[4.22] were flourishing in the “West of the River” and in the “South of the Lake.” Since then they have been regarded as characteristically Zen, and it was Dharma that breathed this spirit into the minds of the Chinese Buddhists. The latter had more or less been given up, on the one hand, to philosophising, and, on the other hand, to practising contemplation. They were not acquainted with the direct method of Zen which was to see straightway into the truth of Enlightenment and attain Buddhahood without going through so many stages of preparation prescribed by the scholars. * * * * * Our knowledge of the life of Bodhi-Dharma comes from two sources, the one which the earliest record we have of him is by Tao-hsüan[4.23] in his _Biographies of the High Priests_ which was compiled early in the T‘ang dynasty, A.D. 645. The author was the founder of a Vinaya sect in China and a learned scholar, who however was living before the movement of the new school to be known as Zen came into maturity under Hui-nêng, the sixth patriarch, who was nine years old when Tao-hsüan wrote his _Biographies_. The other source is the _Records of the Transmission of the Lamp_, A.D. 1004, compiled by Tao-yüan[4.24] early in the Sung dynasty. This was written by a Zen monk after Zen had received full recognition as a special branch of Buddhism, and contains sayings and doings of its masters. The author often refers to some earlier Zen histories as his authorities which are however lost now being known by the titles only.