Mbh 12.89.1b

Subdue thy foes, protect thy subjects, worship the deities in sacrifices, and fight battles with courage, O delighter of the Kurus! A king should protect those that deserve protection. The king who does this is the best of rulers. Those kings that do not exercise the duty of protection live a vain life. For the benefit of all his subjects the king should always seek to ascertain the acts and thoughts of all, O Yudhishthira; and for that reason he should set spies and secret agents.[262] Protecting others from thy own, and thy own from others, as also others from others, and thy own from thy own, do thou always cherish thy people. Protecting his own self first from every one, the king should protect the earth. Men of knowledge have said that everything has its root in self. The king should always reflect upon these, viz., What are his laches, to what evil habits he is addicted, what are the sources of his weakness, and what are the sources of his faults. The king should cause secret and trusted agents to wander through the kingdom for ascertaining whether his conduct as displayed on the previous day has or has not met with the approbation of the people. Indeed, he should ascertain whether his conduct is or is not generally praised, or, is or is not acceptable to the people of the provinces, and whether he has or has not succeeded in earning a good name in his kingdom. Amongst those that are virtuous and possessed of wisdom, those that never retreat from battle, and those that do not reside in thy kingdom, those that are dependent on thee, and those that are thy ministers, as well as those that are independent of party, they that praise or blame thee should never be objects of disregard with thee, O Yudhishthira![263] No man, O sire, can succeed in earning the good opinion of all persons in the world. All persons have friends, foes, and neutrals, O Bharata!"