直笔叙人事重在有识见“史有三长:才、学、识,世罕兼之,故史者少。夫有学无才,犹愚贾操金,不能殖货;有才无学,犹巧匠无楩楠斧斤,弗能成室。善恶必书,使骄君贼臣知惧,此为无可加者。”(《新唐书·列传第五十七刘知几本传》)刘知几的这段话告诉我们,要做一个优秀的史学家,必须具有才、学、识三长。刘知几的史识是包括史德在内的,因为要做到善恶必书,固然要有辨别善恶的“识”,但这种“识”若没有德做为基础是不会产生的。因此,刘知几把“善恶必书”作为“识”的最高表现是有道理的。《史通》对这个问题谈得很多, Straightforward narrative of personnel emphasis on knowledge “History has three long: only, learning, knowledge, the world of both Han, history less. No one can say hello, so that no one can add. ”(“ The New Tang Dynasty biography fifty-seventh Liu know a few Biography ”) Liu Zhiji’s remark tells us that to be an excellent historian, we must have talents, learning ability and knowledge. Liu Zhiji’s historical knowledge is included, including the virtue, because to do good and evil must be a book, although there must be a distinction between good and evil, “knowledge”, but this “knowledge” if there is no moral as a basis will not produce of. Therefore, Liu Zhiji several “good and evil must book” as the highest manifestation of “knowledge” is justified. “Stratton” talked a lot about this issue,