Hatha yoga In all three texts, meditation is the ultimate goal of all the preparatory cleansing, asanas, pranayama and other steps. The aim of this meditation is to realize "Nada-Brahman", or the complete absorption and union with the Brahman through inner mystic sound. According to Guy Beck – a professor of Religious Studies known for his studies on Yoga and music, a Hatha yogi in this stage of practice seeks "inner union of physical opposites", into an inner state of samadhi that is described by Hatha yoga texts in terms of divine sounds, and as a union with "Nada-Brahman" in musical literature
Aparoksha from which unity of existence is derived. This knowledge is gained by establishing a "guru-shishya sambandha" (Guru-shishya tradition) with a teacher who has already experienced that kind of knowledge (Aparoksanubhuti); the karma or acts required to be done, after gain of "Aparoksha jnana" is "Vidya-karma" which consists in "sravana" (hearing of srutis), "manana" (reflection) and "nididhyasana" (meditation on Brahman). Aparoksha is "savikalpa jnana" (knowledge) when one re-recognizes the non-dual nature of the ever-realized Self (Tat Tvam Asi), it is the immediate knowledge gained through the "pramanas"; practice of "Dhyana" (meditation) removes all "vikalpas" (varied thoughts) and leads to "nirvikalpa" or