Mbh 12.246.1c

Unto that person, however, who is possessed of fame, or who deserveth applause (for his virtues), or who is of tranquil soul, or possessed of ascetic merit, unto a Brahmana who is such, unto one's son or dutiful disciple, this discourse containing the very essence of duties should be communicated, but on no account should it be communicated to others. If any person makes a gift of the whole earth with all her treasures, unto one conversant with truth, the latter would still regard the gift of this knowledge to be very much superior to that gift. I shall now discourse to thee on a subject that is a greater mystery than this, a subject that is connected with the Soul, that transcends the ordinary understandings of human beings, that has been beheld by the foremost of Rishis, that has been treated in the Upanishads, and that forms the topic of thy inquiry. Tell me what after this is in thy mind? Tell me in what thou has still any doubt? Listen, for here I am, O son, faces turned towards all directions. The Sun and the Moon are thy two seated before thee! Upon what indeed, shall I once more speak to thee?'"'"