宋高僧傳 17.11

17.11

系曰：知彼敵情，資乎鄉導；或「入」必爭之境，免書「弗地」之譏；又猶秉爥霄征，便匪如人入闇。歷聞玄嶷曾寄黃冠，熟其本教。及歸釋族，斥彼妄源。不須四月而試之，已納一城之欵矣。由是觀之，脫有逜逆之者，則曰「吾當說汝真」，斯是之謂歟！

Appraisal: To know the enemy's dispositions requires the aid of a guide; or when entering a territory that must be contested, one avoids the censure of being recorded as "not having the land"; it is also like holding a torch while marching by night, so that it is not like a person entering darkness. We have heard that Xuanyi previously dwelt among the Daoists and was familiar with their original teachings. When he returned to the Śākya clan, he refuted their deluded origins. Without needing four months to test them, he had already accepted the surrender of a whole city! Viewed from this perspective, if perchance there were those who rebelled and resisted, and one said, "I shall speak your truth," does it not refer to this?