《宋史·列传·卷九十九》
神宗因彗星出现求言，大防陈述三说九宜：曰治本、曰缓末、曰纳言。
神宗以彗星求言，大防陈三说九宜：曰治本，曰缓末，曰纳言。
Because of the appearance of the comet, Shenzong asked for advice, and Dafang presented three theories and nine suggestions: called governance, called mitigation, and called advice.