In the life of the Zendo there is no fixed period of graduation as in a school education. With some, graduation may not take place even after his twenty years’ boarding there. But with ordinary abilities and a large amount of perseverance and indefatigability, one is able to probe into every intricacy of the teachings of Zen within a space of ten years. To practise the principle of Zen, however, in every moment of life, that is, to grow fully saturated in the spirit of Zen is another question. One life may be too short for it, for it is said that even Śākyamuni and Maitreya themselves are yet in the midst of self-training. To be a perfectly qualified master, a mere understanding of the truth of Zen is not sufficient. One must go through a period which is known as “the long maturing of the sacred womb.”[7.31] The term must have originally come from Taoism; and in Zen nowadays it means, broadly speaking, living a life harmonious with the understanding. Under the direction of a master, a monk may finally attain to a thorough knowledge of all the mysteries of Zen; but this is more or less intellectual, though in the highest possible sense. The monk’s life, in and out, must grow in perfect unison with this attainment. To do this a further training is necessary, for what he has gained at Zendo is after all the pointing of the direction where his utmost efforts have to be put forth. But it is not at all imperative now to remain in the Zendo. On the contrary, his intellectual attainments must be further put on trial by coming into actual contact with the world. There are no prescribed rules for this “maturing.” Each one acts on his own discretion in the accidental circumstances in which he may find himself. He may retire into the mountains and live a solitary hermit, or he may come out into the “market” and be an active participant in all the affairs of the world. The sixth patriarch is said to have been living among the mountaineers for fifteen years after he left the fifth patriarch. He was quite unknown in the world until he came out to a lecture by Inshu (Yin-tsung).[7.32] Chu, the National Teacher of Nan-yang, spent forty years in Nanyang and did not show himself out in the capital. But his holy life became known far and near, and at the urgent request of the Emperor he finally left his hut. Isan (Wei-shan) spent several years in the wilderness, living on nuts and befriending monkeys and deer. However, he was found out and big monasteries were built about his anchorage, he became master of 1,500 monks. Kwanzan,[7.33] the founder of Myōshinji, Kyoto, retired in Mino province, and worked as day-labourer for the villagers. Nobody recognised him until one day an accident brought out his identity and the court insisted on his founding a monastery in the capital.[f150] Hakuin became the keeper of a deserted temple in Suruga which was his sole heritage in the world. We can picture to ourselves the scene of