The fact that scriptures play such a significant role in the supposedly mainly oral culture of Chinese popular religion raises a number of questions: Who writes them? How are they used? What religious ideas do they manifest? How do they appropriate and affect the cult of their protagonist deities? The present article seeks to address these questions using the case of Guanyin’s Lotus Sutra of the Marvellous Dao (Guanyin miaodao lianhua jing), a text revealed between 1998 and 2000 by means of spirit-writing at a Taichung city phoenix hall, the Xuyuan tang.The analysis of the scripture’s structure and rhetoric reveals that the Guanyin sutra represents a mode of popular and sectarian engagement with the Buddhist tradition that differs from and enriches the picture provided for us by Chün-fang Yü’s studies of Guanyin and by Prasenjit Duara’s notion of “superscription.” While we are definitely looking at a layering of meanings, as Duara did by regarding the Guandi myth as “a palimpsest of layered meanings,” the image of “superscription” does not accurately describe the way the Guanyin sutra does not so much overwrite but underlay Buddhist devotionalism with phoenix hall notions of Dao cultivation. In effect, the Guanyin sutra provides an inclusivist re-anchoring of Guanyin-related devotional practices in a core set of sectarian notions of personal cultivation, thus allowing us to differentiate a distinct mode of the syncretic construction of religious doctrine in a popular sectarian context.