The yoga or contemplative philosophy of the Hindus is rich, exuberant, grand and sublime, in as much as it comprehends within its ample sphere and deep recesses of mediation, all that is of the greatest value, best interest and highest importance to mankind as physical, moral, intellectual and spiritual beings a knowledge of the cosmos of the physical and intellectual worlds. The principal Gods Brahma and Siva are represented as Yogis the chief sages Vyasa. Valmiki, Vasistha and Yajnavalkya were propounders of Yoga system; the saints one and all were adepts in yoga. Yogavasistha is the greatest work of the Yoga-philosophy by Valmiki known by several names. This work has six chapter known as prakaranas as 1. Vairagava prakarana, 2. Mumuksu vyahara prakarana, 3. Utpatti prakarana, 4. Sthiti prakarana, 5. Upasama prakarana, 6. Nirvana prakarana.