Mbh 5.29.1b

It is by virtue of work that the sleepless Surya rises every day and becomes the cause of day and night, and Soma passes through the months and the fortnights and the combinations of constellations. Fire is kindled of itself and burns by virtue of work, doing good to mankind. The sleepless goddess Earth, sustains by force this very great burden. The sleepless rivers, giving satisfaction to all (organised) beings, carry their waters with speed. The sleepless Indra, possessed of a mighty force, pours down rain, resounding the heaven and the cardinal points. Desirous of being the greatest of the gods, he led a life of austerities such as a holy Brahmana leads. Indra gave up pleasure, and all things agreeable to the heart. He sedulously cherished virtue and truth and self-control, and forbearance, and impartiality, and humanity. It was by work that he attained a position the highest (of all). Following the above course of life, Indra attained the high sovereignty over the gods. Vrihaspati, intently and with self-control, led in a proper manner that life of austerities which a Brahmana leads. He gave up pleasure and controlled his senses and thereby attained the position of the preceptor of the celestials. Similarly, the constellations in the other world, by virtue of work, and the Rudras, the Adityas, the Vasus, king Yama, and Kuvera, and the Gandharvas, the Yakshas, and the celestial nymphs, all attained their present position by work. In the other world, the saints shine, following a life of study, austerity and work (combined). Knowing, O Sanjaya, that this is the rule followed by the best of Brahmanas, and Kshatriyas, and Vaisyas, and thou being one of the wisest men,--why art thou making this endeavour on behalf of those sons of Kurus? Thou must know that Yudhishthira is constantly engaged in the study of the Vedas. He is inclined to the horse-sacrifice and the Rajasuya.