Mbh 12.322.2c

Like the she-wolf snatching away a lamb, Death snatches away one that is still engaged in earning wealth and still unsatisfied in the indulgence of his pleasures. When thou art destined to enter into the dark, do thou hold up the blazing lamp made of righteous understanding and whose flame has been well-husbanded out. Falling into various forms one after another in the world of men, a creature obtains the status of Brahmanhood with great difficulty. Thou hast obtained that status. Do thou then, O son endeavour to maintain it (properly).[1715] A Brahman hath not been born for the gratification of desire. On the other hand, his body is intended to be subjected to mortification and penances in this world so that incomparable happiness may be his in the next world. The status of Brahmanhood is acquired with the aid of long-continued and austere penances. Having acquired that status, one should never waste one's time in the indulgence of one's senses. Always engaged in penances and self-restraint and desirous of what is for thy good, do thou live and act, devoted to peace and tranquillity. The period of life, of every man, is like a steed. The nature of that steed is unmanifest. The (sixteen) elements (mentioned before) constitute its body. Its nature is exceedingly subtile. Kshanas, and Trutis, and Nimeshas are the hair on its body. The twilights constitute its shoulder joints. The lighted and the dark fortnights are its two eyes of equal power. Months are its other limbs. That steed is running incessantly. If thy eyes be not blind, beholding then that steed incessantly moving forward in its invisible course, do thou set thy heart on righteousness, after hearing what thy preceptors have to say on the question of the next world.