《战国策·赵二·秦攻赵》
秦国攻打赵国，苏秦对秦王说， 臣下听说贤明的君王对待他的臣民，普遍地进行教导并教给他们各种本领，因此官吏不耽误国家大事，民力不困乏；对于他们的言论，广泛听取随时采用，因此国家的事业就不会衰败，丑恶的东西就不会显露出来。
秦攻赵，苏子为谓秦王曰： 臣闻明王之于其民也，博论而技艺之，是故官无乏事而力不困；于其言也，多听而时用之，是故事无败业而恶不章。
The state of Qin attacked the state of Zhao, and Su Qin said to the king of Qin, "I have heard that a wise king treats his subjects, teaches them various skills, so that state officials do not delay state affairs and the people's strength is not exhausted; for their speech, listen widely and adopt it at any time, so that the state's cause will not decline and ugly things will not be revealed.