From 《
史记·
平原君列传》: Zhao retainer Mao Sui persuades the king of Chu to send troops, after which Lord Pingyuan says Mao Sui's tongue 'is mightier than a million soldiers' and his single visit to Chu made Zhao 'heavier than the nine tripods' (
九鼎 were the sacred bronze vessels symbolizing dynastic legitimacy).