To give another instance. When Hui-nêng saw Huai-jang, of Nan-yüeh, he said, “Whence comest thou?” which was followed by “What is it that so cometh?”[4.60] It took for Huai-jang eight long years to answer the question satisfactorily. Afterwards this way of questioning became almost an established form of greeting with Zen masters. Nan-yüan asked a newly arrived monk, “Whence comest thou?” “I am from Han-shang.” Said the master, “You are at fault as much as I am.”[4.61] Hsiang-yên asked San-shêng, “Whence comest thou?” “From Lin-chi.” “Bringest thou his sword?” San-shêng took up his seat-cloth (_tso-chu_) and struck Hsiang-yên across his mouth and went away.[4.62] The Venerable Ch‘en asked a monk, “Whence comest thou?” “From Yang-shan.” “Thou art a liar!” was the verdict of the master.[4.63] Another time he asked another monk, “Whence comest thou?” “From West of the River, sir.” “How many sandals hast thou worn out?” This monk had evidently a gentler treatment. This difference of method between the Indian and the Chinese often raised the question as to the difference, if there be, between the “Tathagata Dhyana” and the “Patriarchal Dhyana.” For instance, when Hsiang-yên showed his song of poverty to Yang-shan, the latter said, “You understand the Tathagata Dhyana but not yet the Patriarchal Dhyana.” When asked about the difference, Mu-chou replied, “The green mountains are green mountains, and the white clouds are white clouds.”[4.64] VII Hui-nêng died at the age of seventy-six in A.D. 712, while the T‘ang dynasty was enjoying its halcyon days and Chinese culture reached the highest point in its history. A little over one hundred years after the passing of the sixth patriarch, Liu Tsung-yüan, one of the most brilliant literati in the history of Chinese literature, wrote a memorial inscription on his tomb-stone when he was honoured by the Emperor Hsien-tsung with the posthumous title, Great Mirror (_tai-chien_),and in this we read[4.65]: “In a sixth transmission after Dharma there was Tai-chien. He was first engaged in menial labour and servile work. Just a few words from the master were enough and he at once understood the deepest meaning conveyed in them. The master was greatly impressed and finally conferred on him an insignia of faith. After that he hid himself in the southern district, nobody heard of him again for sixteen years when he thought the time was ripe for him to come out of the seclusion. He was settled at Ts‘ao-ch‘i and began to teach. The number of disciples is said once to have reached several thousands. According to his doctrine, non-doing is reality, emptiness is the truth, and the ultimate meaning of things is vast and immovable. He taught that human nature in its beginning as well as in the end is thoroughly good and does not require any artificial weeding-out, for it has its root in that which is serene. The Emperor Chung-tsung heard