Mahabharata 12.26.32

12.26.32

dīkṣāṃ yajñe pālanaṃ yuddhamāhuryogaṃ rāṣṭre daṇḍanītyā ca samyak |
vittatyāgaṃ dakṣiṇānāṃ ca yajñe samyagjñānaṃ pāvanānīti vidyāt || 32 ||

They however, that occupy an intermediate place suffer misery. This, O Yudhishthira, is what Senajit of great wisdom said, that person who was conversant with what is good or bad in this world, with duties, and with happiness and misery. He who is grieved at other people's griefs can never be happy. There is no end of grief, and grief arises from happiness itself. Happiness and misery, prosperity and adversity, gain and loss, death and life, in their turn, wait upon all creatures. For this reason the wise man of tranquil soul should neither be elated with joy nor be depressed with sorrow. To be engaged in battle has been said to be the Sacrifice for a king; a due observance of the science of chastisement is his Yoga; and the gift of wealth in sacrifices in the form of Dakshina is his Renunciation. All these should be regarded as acts that sanctify him. By governing the kingdom with intelligence and policy, casting off pride, performing sacrifices, and looking at everything and all persons with kindness and impartiality, a high-souled king, after death, sports in the region of the gods. By winning battles, protecting his kingdom, drinking the Soma juice, advancing his subjects, wielding judiciously the rod of Chastisement, and casting off his body at last in fight, a king enjoys happiness in heaven.