There was a prime minister during the Song Dynasty named Lü Mengzheng. He came from a very humble background but eventually rose to the position.
On his first day attending court, civil and military officials stood in two lines as Lü Mengzheng led the way toward the emperor. Someone in the line pointed at him and said, “This kind of person* also became prime minister?” (* disrespectful remark). Lü Mengzheng heard it but ignored it and continued walking.
Another official, angered by the remark, wanted to find out who had said it. Lü Mengzheng stopped him and said, “If I know the person’s name, I will remember it for the rest of my life. So I would rather not know.” Everyone admired his magnanimity.
Because Lü Mengzheng possessed such moral character, during his time in office the country was peaceful and the affairs of the state were well governed.
From History of Song – Biography of Lü Mengzheng
#9 吕蒙正不记人过
宋朝有一个宰相叫吕蒙正，出身贫寒，后来当上了宰相。
第一天上朝的时候，文官武将列队两边，吕蒙正带头向皇帝走去。队列中有人指着他说，“这个人居然也当起宰相来了。” 吕蒙正听到不理，一直走过去。另外一个人听到愤愤不平，想要问说话人的名字。吕蒙正制止了他，说，“如果知道了名字，我心里就会记一辈子，所以宁愿不知道。“ 大家都很佩服他的度量。
吕蒙正有这种道德修养，所以他当政期间是个太平宰相，国事也治理得很好。
出自《宋史– 吕蒙正传》