Mahabharata Adi Parva Chapter 142:7

Mahabharata Adi Parva (Sambhava Parva)

Mahabharata Adi Parva Chapter 142:7 Kings should, in the matter of destroying their foes, ever resemble razors in every particular; unpitying as these are sharp, hiding their intents as these are concealed in their leathern cases, striking when the opportunity cometh as these are used on proper occasions, sweeping off their foes with all their allies and dependants as these shave the head or the chin without leaving a single hair. O supporter of the dignity of the Kurus, bearing thyself towards the Pandavas and others also as policy dictateth, act in such a way that thou mayest not have to grieve in future. Well do I know that thou art endued with every blessing, and possessed of every mark of good fortune. Therefore, O king, protect thyself from the sons of Pandu! O king, the sons of Pandu are stronger than their cousins (thy sons); therefore, O chastiser of foes, I tell thee plainly what thou shouldst do. Listen to it, O king, with thy children, and having listened to it, exert yourselves (to do the needful). O king, act in such a way that there may not be any fear for thee from the Pandavas. Indeed, adopt such measures consonant with the science of policy that thou mayest not have to grieve in the future.' "Vaisampayana continued, 'Having delivered himself thus Kanika returned to his abode, while the Kuru king Dhritarashtra became pensive and melancholy.'"