Raikva is an esteemed philosopher mentioned in the Chandogya Upanishad. Despite being a poor cart driver by profession, the Upanishad elevates him to the same level as Uddalaka and Indradyumna in terms of his philosophical wisdom. King Janasruti, a respected philanthropist, came to learn about Raikva and sought his advice on Brahmavidya, the knowledge of the ultimate reality. The story of Raikva and King Janasruti is recounted in Chapter 4 of Chandogya Upanishad. Raikva imparted the teachings of Samvarga Vidya to the king. Samvarga refers to the ability to absorb all the worldly and other elements into oneself. In this context, Prana, the life force, is considered samvarga as it assimilates the functions of the four internal organs: speech, ears, eyes, and mind.