Mbh 12.210.2

"'Bhishma said, "In this connection is cited the old narrative of the discourse between a preceptor and his disciple on the subject of Emancipation. There was a regenerate preceptor who was the foremost of Rishis. He looked like a mass of splendour. Possessed of a high soul, he was firm in truth and a complete master of his senses. Once on a time, a disciple of great intelligence and close attention, desirous of obtaining what was for his highest good, touched the preceptor's feet, and standing with joined hands before him, said, 'If, O illustrious one, thou hast been gratified with the worship I have offered thee, it behoveth thee to solve a great doubt of mine. Whence am I and whence art thou? Tell me this fully. Tell me also what is the final cause. Why also, O best of regenerate ones, when the material cause in all beings is the same, their origin and destruction happen in such dissimilar ways? It beseems thee, O thou of great learning, also to explain the object of the declarations in the Vedas (about difference of rites in respect of different classes of men), the meaning of the injunctions of the Smritis and of those injunctions which apply to all classes of men.'[715]