The Puri of Mathurâ is in every man, the kingdom of his own mind, where the personal self is to be _put down_. Mathurâ is from _math_, to put down. Lavana (Salt), the demon of materialism (for salt is an emblem of materialism; cf. the salt ocean) had hold of this Puri during the time of Râma, and Satrughna killed the demon. But materialism regained its lost ground and the forces of descent gathered strong round Kansa. Kansa was Kâla-nemi, or the mark left by the wheel of time. Each one of us has inherited through countless ages a strong element of materiality, which tries to reign over each one of us. This is the Kansa in each of us. There was also king Kansa of the period when Krishna appeared. He was brought down from his high platform and killed by Krishna, and the spiritual evolution of humanity became assured. There are eight Prâkritic principles in man, corresponding to eight senses. Earth or smell, water or taste, fire or form, air or touch, and akasa or sound, these enable Jivas to acquire experiences from the outside. Ahankâra, or the sense of egoism, enables man to assimilate those experiences to his personal self, and to make a small world of his own self. Then there is Mahat and the universal sense corresponding to it. This sense takes man out of the limits of personality; it raises him to the level of spiritual life. It develops unselfishness and universal life. Last of all is the eighth principle, Mula Prakritî. It gives the sense of perceiving Âtmâ. Krishna helps the evolution of the Jivas, by developing the outer senses first and then the inner senses. When the first six senses are developed, the evolution of personality is complete. The powers that develop the senses do not come any more into requisition. Those powers were the first six brothers of Krishna, who lay slumbering in the ocean, and who were _ardhagarbha_, as Harivansa says. Their action was confined to the material stage of evolution and hence they are said to have descended from Hiranyakasipu. Kansa had no difficulty in slaying these half-dead powers. The sixth brother was Balarâma. He was robed in blue, a highly spiritual color, the color of Mahat. He roused the spiritual sense of man. Jivas had wandered away from their spiritual home, where they were all united, and each had made a separate entity for himself. Balarâma tried to draw them together once more on the plane of Mahat. Hence he was called Sankarshana, and his instrument was called the plough. He was the first born, as men cannot come face to face with Íshvara, so long as they are not raised beyond the limits of personality. Jivas streamed forth from the plane of Mahat, presided over by Atlanta or Sankarshana, and they are drawn back to that plane so that they may set out on a higher spiritual journey.