The earlier writers conceived the Fourfold Noble Truth or the Twelvefold Chain of Causation, or the Eightfold Path of Righteousness to be the central teaching of Buddhism, which also included on the psychological side the theory of non-ego (_anātman_). But when we reflect, both philosophically and from the Zen point of view, on the life of the Buddha and on the ultimate principle of Buddhahood, we cannot help thinking of his Enlightenment as the most significant and most essential and most fruitful part of Buddhism. Therefore, what the Buddha really wished to impart to his disciples must be said to have been the Doctrine of Enlightenment in spite of the Hinayanistic interpretation or understanding of what is known as primitive Buddhism. But as long as Buddhism flourished in India, this its central idea remained what it was, that is, such as is developed in most of the Mahayana Sutras. It was only after Bodhi-Dharma who brought it to China that the idea took root there and grew up to what we designate now specifically as the Zen school of Buddhism. The history of Zen, therefore, properly speaking or in its narrower sense, may best be regarded as beginning in China. The Indian soil was too metaphysical, too rich in romantic imagination for Zen to grow as such in its pure form. While the attainment of Buddhahood or Arhatship was the ultimate goal of his teaching, the Buddha was practical and always close to the facts of life and insisted in his ordinary sermons on a life regulated by moral rules. Nor had he any desire to disclose intellectually or metaphysically the content of Enlightenment which must be experienced but cannot be explained. He never neglected to emphasise the significance of self-realisation, for Nirvana or Enlightenment was to be attained personally through one’s own efforts in one’s own inner consciousness. The Fourfold Noble Truth or the Twelvefold Chain of Causation or the Theory of Non-ego was an intellectual guide to the realisation of the Buddhist life. Such teaching could not have any practical meaning except as finally leading to Enlightenment. The Buddha never thought that his followers would come to lay the entire stress of his teaching on these intellectual structures which could not stand by themselves without being supported by an inner spirit. The Eightfold Path of Righteousness was an ethical guide to Enlightenment, and as such it was regarded by the Buddha. Those who have no higher insight into his teaching than reading a moral signification in it, take it for a kind of ethical culture and no more. They think that Buddhism is a positivism as philosophy and its Brotherhood (_saṁgha_) a body of moral ascetics. They praise the Buddha as the originator of a scientific religious system free from spiritualistic superstitions which so frequently and abundantly grow around religion. But we know better because these comments are not in full accord with the teaching