The Great Epic of the Bhārata dynasty 5.29.7

5.29.7

so'yaṃ vidhirvihitaḥ karmaṇaiva tadvartate saṃjaya tatra karma |
tatra yo'nyatkarmaṇaḥ sādhu manyenmoghaṃ tasya lapitaṃ durbalasya || 7 ||

Those branches of knowledge that help the doing of work, bear fruit, but not other kinds, for the fruit of work is of ocular demonstration. A thirsty person drinks water, and by that act his thirst is allayed. This result proceeds, no doubt, from work. Therein lies the efficacy of work. If anyone thinks that something else is better than work, I deem, his work and his words are meaningless. In the other world, it is by virtue of work that the gods flourish. It is by work that the wind blows. 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.