道宣律師感通錄 1.20

1.20

I asked again: "If so, when the kings after King Mu of Zhou came across the placement of stupas, why do written records in this land rarely mention them?" He replied: "Efficacious stupas existed due to past conditions; Prabhūtaratna was made by spirits and divinities. Few humans have seen them, so few written records have been transmitted. Yang Xiong and Liu Xiang searched the shrine records and occasionally saw them. Regarding Buddhist scriptures, how could it be that scriptures and stupas did not already exist prior to Qin?"