肇論新疏 3.174

3.174

《長阿含》等說：「如來向拘尸羅城，中路背痛，令弟子四疊僧伽黎樹下休息」等。天棺，即金棺也。依古聖輪王葬儀而作，故言天棺。意云：身心非有，自感而興，非益能盈、非損可虧，豈同小乘之見，半路背痛、雙林壽終，靈智滅於天棺、聖體灰於焚燎也。

The Dīrghāgama and other texts state: 'When the Tathāgata was heading toward the city of Kuśīnagara, his back pained him along the way, and he bade his disciples fold a saṅghāṭī fourfold for him to rest beneath a tree,' and so forth. 'Heavenly coffin' refers to the golden coffin; it was made in accordance with the ancient funerary rites for a sacred cakravartin, hence it is called a heavenly coffin. The intended meaning is: body and mind are not existent [in themselves]; they arise spontaneously from stimulation. Neither can gain augment them, nor can loss diminish them. How could it be like the view of the Hīnayāna—that his back pained him midway on the road, his life ended in the twin groves, his spiritual wisdom was extinguished in the heavenly coffin, and his sacred form was turned to ashes in the cremation pyre?