Nahusha's son Yayati, in describing the mysteries of king-craft, said that a person in ruling men should kill even contemptible foes.
एवं राजोपनिषदं ययातिः स्माह नाहुषः। मनुष्यविषये युक्तो हन्ति शत्रूननुत्तमान्॥