《资治通鉴·汉纪·汉纪四十四》
做儿子最大的罪恶，莫过于连累父母；做臣子最大的罪恶，莫过于诽谤君王。李固的过错和罪恶，理应诛杀。 
夫子罪莫大于累父，臣恶莫深于毁君，固之过衅，事合诛辟。 
As a son, the greatest crime is harming one's parents. As a subject, the greatest crime is slandering one's lord. Li Gu's transgressions and crimes are such that he deserves to be executed. 