Mbh 13.14.13a

"'"'The illustrious Sankara said, "O dear Upamanyu, I am gratified with thee. Behold me, O foremost of Munis, O learned Rishi, thou art firmly devoted to me and well hast thou been tested by me. I have been very highly pleased with thee in consequence of this thy devotion to Siva. I shall, therefore, give thee today the fruition of whatever desires thou mayst have in thy heart." Thus addressed by Mahadeva of great wisdom, tears of joy came into my eyes and my hair stood on its end (through emotion). Kneeling down unto him and bowing unto him repeatedly, I then, with a voice that was choked with delight, said unto him,--"O illustrious god, it seems to me that I was hitherto dead and that it is only today that I have taken my birth, and that my birth hath today borne fruit, since I am staying now in the presence of Him who is the Master of both the deities and the Asuras! Who else is more praiseworthy than I, since I am beholding with these eyes of mine, Him of immeasurable prowess whom the very deities are unable to behold without first paying hearty worship? That which they that are possessed of learning and wisdom say is the highest of all topics, which is Eternal, which is distinguished from all else, which is unborn, which is Knowledge, which is indestructible, is identical with thee, O puissant and illustrious one, thee that art the beginning of all the topics, thee that art indestructible and changeless, thee that art conversant with the ordinances which govern all the topics, thee that art the foremost of Purushas, thee that art the highest of the high. Thou art he that hadst created from thy right side the Grandsire Brahma, the Creator of all things. Thou art he that hadst created from thy left side Vishnu for protecting the Creation. Thou art that puissant Lord who didst create Rudra when the end of the Yuga came and when the Creation was once more to be dissolved.