The Sanskrit word "Yoga" means "union," which is the union of the individual self or soul with the nondual, absolute reality. While Yoga can be described in different ways, it has to do with the realization through direct experience of the preexisting union between Atman and Brahman, Jivatman and Paramatman, and Shiva and Shakti, or the realization of Purusha standing alone as separate from Prakriti. The word "Yoga" is virtually one and the same with the word "Samadhi," the deep, transcendent realization of the highest truth or reality. Each of these Sanskrit terms relates to the subtleties of Yoga as described in the various paths of Yoga, Vedanta, and Tantra.
Human beings are accustomed to feeding themselves only with solid, liquid and gaseous elements and what do they do with the fourth element, Fire and Light? Nothing. They have not learnt how to sustain themselves with light and yet it is even more necessary than air.
As long as he continues to nourish his brain only with solid, liquid or gaseous elements (which the brain needs the least), man's understanding will be very limited. He may understand material things, but he will never be able to grasp the mysteries of the Universe
