折疑論 4.78

4.78

是皆儒也。而無梯乎。徐福之與河上（秦紀。徐福為道士習僊。秦始皇令齎童男童女海上求神僊不死之藥。舟於海中巡致湮溺。河上者。河上公也。漢文帝。以師禮之）。

These were all scholars, yet were there no steps between them? Consider Xu Fu compared to Heshang (Qin Annals: Xu Fu was a Daoist practicing immortality. The First Emperor of Qin ordered him to take virgin boys and girls out to sea to seek the elixir of immortality from the divine immortals; the boats roamed the sea and ended up drowned. Heshang refers to Heshang Gong; Emperor Wen of Han honored him as a teacher).