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them, he subdues time and becomes a Kalajayi Yogi. By commingling the Sun and the Moon, so that they can no longer work independently, the Yogi's state of the mind goes beyond the reach of the senses, which is Samadhi or the final state of Yoga process.
This Samadhi is the final state of bliss, or the Advaya or Yuganaddha state as found in esoteric Buddhism. The word Advaya means a synthesis of a!l duality in the principle of unity or achievement of the non-dual state. This principle of non-duality was adopted by Luipa and others, who have given repeated warnings not to go either to the left or the right, but to follow the middle path. The middle nerve in the body is the most important nerve and is called the middle path by the Siddhacaryas.
The human body was conceived as a microcosm, in which everything found in the macrocosm has a parallel. In Hindu Tantrik Texts we find similar ideas. Siva and Shakti reside in the body, in the lowest of the nerve centres lies Shakti in its dormant state, the Yogi rouses it and makes it follow the middle nerve (the Susumna) and unite with Siva in the highest centre (the Sahasrara), the thousand petalled lotus in the head. Thus Siva and Shakti unite in Samarasa or Advaya state which is the Yuganaddha state of the Sahajia Buddhists. The nerves on the left and right in the human body, represents the principles of duality. The Yogi checks the separate functions of duality, and unites them with the middle nerve to function conjointly. This middle nerve or path leads the Yogi to 'truth', while the other two on the left and right lead him to pollution. When the two nerves are controlled, the anahta nada or spontaneous sound, within the recesses of one's soul can be heard. By the control of the nerves is really meant the Apana wind which has a downward motion and the Prana which has the upward motion should both be arrested by Yogic practice and then made to follow through the middle nerve and held there by a mudra known as Kumbhaka. Thus the mind of the Yogi becomes steady, his breaths are suspended and the senses are controlled, and he achieves his final aim of attaining Samadhi. The siddhas of Ancient India laid special emphasis on Kaya-sadhana or culture of the body. The Natha Siddhas
