佛祖統紀 41.37

41.37

In the first year of Yongzhen, an edict summoned Chan Master Shili into the inner palace to inquire about Chan principles. The emperor asked, 'How can the living beings of the great earth see their nature and become Buddhas?' Li said, 'The Buddha-Dharma is like the moon in the water: the moon can be seen, but cannot be grasped.' The emperor was pleased (the Master had attained the Dharma from Master Qian of Shitou). Śramaṇa Saichō of the state of Japan came to study the teachings under Master Sui of Tiantai, copied all the treatises and commentaries of the tradition to return home, which was the beginning of the transmission of the teachings to Japan.