《资治通鉴·汉纪·汉纪四十七》
自明帝永平年间以来，臣下和人民虽然有崇信和传习佛教的人，然而皇帝尚没有接受和喜好。到了桓帝时，才开始笃信佛教，经常亲自祭祀和祈祷，从此佛教越发盛行。所以，襄楷才在上书中谈到它。
自永平以来，臣民虽有习浮屠术者，而天子未之好；至帝，始笃好之，常躬自祷祠，由是其法侵盛，故楷言及之。
Since Emperor Ming's Yongping years, while some ministers and civilians did venerate and practice Buddhism, the emperor had not yet accepted or favored it. By the time of Emperor Huan, he began to believe heavily in Buddhism, often personally offering sacrifices and praying, and from then on, Buddhism became even more popular. This is why Xiang Kai mentioned it in his letter.