Besides these characteristics, Zen is noted for its physical and mental training. That the daily practice of Zazen[FN#12] and the breathing exercise remarkably improves one's physical condition is an established fact. And history proves that most Zen masters enjoyed a long life in spite of their extremely simple mode of living. Its mental discipline, however, is by far more fruitful, and keeps one's mind in equipoise, making one neither passionate nor dispassionate, neither sentimental nor unintelligent, neither nervous nor senseless. It is well known as a cure to all sorts of mental disease, occasioned by nervous disturbance, as a nourishment to the fatigued brain, and also as a stimulus to torpor and sloth. It is self-control, as it is the subduing of such pernicious passions as anger, jealousy, hatred, and the like, and the awakening of noble emotions such as sympathy, mercy, generosity, and what not. It is a mode of Enlightenment, as it is the dispelling of illusion and of doubt, and at the same time it is the overcoming of egoism, the destroying of mean desires, the uplifting of the moral ideal, and the disclosing of inborn wisdom. [FN#12] The sitting-in-meditation, for the full explanation of which see Chapter VIII. The historical importance of Zen can hardly be exaggerated. After its introduction into China in the sixth century, A.D., it grew ascendant through the Sui (598-617) and the Tang dynasty (618-906), and enjoyed greater popularity than any other sect of Buddhism during the whole period of the Sung (976-1126) and the Southern Sung dynasty (1127-1367). In these times its commanding influence became so irresistible that Confucianism, assimilating the Buddhist teachings, especially those of Zen, into itself and changing its entire aspect, brought forth the so-called Speculative philosophy.[FN#13] And in the Ming dynasty (1368-1659) the principal doctrines of Zen were adopted by a celebrated Confucian scholar, Wang Yang Ming,[FN#14] who thereby founded a school, through which Zen exercised profound influence on Chinese and Japanese men of letters, statesmen, and soldiers. As regards Japan, it was first introduced into the island as the faith first for the Samurai or the military class, and moulded the characters of many distinguished soldiers whose lives adorn the pages of her history. Afterwards it gradually found its way to palaces as well as to cottages through literature and art, and at last permeated through every fibre of the national life. It is Zen that modern Japan, especially after the Russo-Japanese War, has acknowledged as an ideal doctrine for her rising generation. [FN#13] See 'A History of Chinese Philosophy,' by Ryukichi Endo, and A History of Chinese Philosophy,' by Giichi Nakauchi. [FN#14] For the life of this distinguished scholar and soldier (1472-1529), see 'A Detailed Life of O Yo Mei' by Takejiro Takase, and also 'O-yo-mei-shutsu-shin-sei-ran-roku.' CHAPTER I