Raikva

Along with Uddalaka, Prachinshala, Budila, Sarkarakshaya and Indradyumna, who respectively held earth, heaven, water, space and air to be the substrata of all things, and many others, Raikva was one of the leading Cosmological and Psychological philosophers of the Upanishads.

[3] He had come to know about Raikva by chance from the swans, who already impressed by his deeds of charity, had seen him, and whose conversation he happened to overhear.

He approached Raikva with gifts, and after being called a Sudra (Sudra means one who is tormented by cravings and therefore, by pain and suffering), he accosted Raikava again with even richer gifts and his beautiful daughter in offer.

With Prana considered by Ushasti Chakrayana as the life-principle Raikva brings out a correspondence between the macrocosm and the microcosm as the universal and in living things, as the final absorbent.

Raikva was a mystic who knew about the relationship between the macrocosm and the microcosm and concluded that the two which are such, are surely the two places of merger – air indeed in the case of gods, the vital force in the case of organ, that absorption is the important quality to be meditated upon as Air and Prana.