An Si toan thu la mot tap sach khuyen thien duoc Dai su An Quang nhieu lan khen ngoi. Dich than ngai cung da van dong, to chuc viec in an luu hanh, so luong len den hang van quyen. Vi the, lan dau tien tiep xuc voi bo sach nay bang Han van, ban than toi da khong khoi khoi sinh mot vai ban khoan, nghi van.
Vi sao lai ban khoan, nghi van? Vi khi nhin qua tong muc sach nay, noi bat len la phan Am chat van quang nghia, von dua vao bai van Am chat cua Van Xuong De Quan de giang rong. Cac phan con lai la Tay quy truc chi, Van thien tien tu va Duc hai hoi cuong co the tam chua ban den, nhung rieng ve bai van Am chat thi duong nhu khong nam trong Giao phap cua duc Phat.
Van Xuong De Quan la mot nhan vat hu hu that that, tuy mot phan truyen tich ve ong co the tam cho la that, nhung lai co vo so dieu duoc theu det them chung quanh hinh anh cua ong, ma phan lon deu la nhung kieu niem tin mong muoi, thieu tri tue, neu khong muon noi la me tin. Nhu vay, nhung loi truyen lai cua mot nhan vat nhu the lieu co dang de nguoi Phat tu phai luu tam nghien tam hoc hoi hay chang? Mot tap sach nhu vay lieu co dang de luu hanh rong rai hay khong?...
Nhung Dai su An Quang von la bac long tuong trong Phat giao. Cuoc doi va dao nghiep cua ngai qua du de chung ta dat niem tin vao nhung loi khuyen cua ngai. Dai su noi ve sach An Si toan thu va soan gia la tien sinh Chu An Si nhu sau:
"...qua that la mot quyen ky thu khuyen thien bac nhat trong thien ha, neu so voi nhung quyen sach khuyen thien tam thuong khac, ha co the sanh cung duoc sao? Long toi van tin chac rang tien sinh han la bac Bo Tat theo ban nguyen ma hien than cu si de thuyet phap do sinh."
(Trich Loi tua cua Dai su An Quang)
Chinh niem tin vao Dai su An Quang da khuyen khich toi tiep tuc doc vao sach An Si toan thu, thay vi gac no sang mot ben sau khi nhan ra co su hien dien cua nhan vat goi la Van Xuong De Quan.