Mbh 12.181.2a

"'Bhishma said, "If the mind becomes affected by desire, wrath and other evil passions, it then runs towards sin. If one's acts are stained by sin, one is obliged to dwell in painful regions. Sinful men take birth in indigent circumstances and repeatedly suffer the pangs of famine, woe, fear, and death. Those that are virtuous in their acts, and possessed of faith, and that have their senses under control, become born as affluent men and repeatedly sport in festivities and heaven and happiness. Unbelievers, with their arms manacled, are sent to regions rendered inaccessible by carnivorous beasts and elephants and full of terrors in consequence of snakes and robbers. What more need be said of them? They, on the other hand, who have reverence for gods and guests, who are liberal, who are fond of good and honest men, go, in consequence of their acts of charity, along that happy way which belongs to persons of cleansed souls. They that have no reverence for virtue are as vile among men as seedless grains among corn or the gnat among birds. That which is ordained in consequence of the acts of a past life pursues the actor even if the latter strives his best for leaving it behind.[544] It sleeps when he sleeps and does whatever else he does.[545] Like his shadow it rests when he rests, proceeds when he proceeds, and acts when he acts. Whatever acts a man does he has certainly to obtain the fruits thereof. Death is dragging all creatures who are surely destined to fall (into orders of existence they deserve) and who are surely liable to enjoy or suffer that which has been ordained as the consequence of their acts. The acts of a past life develop their consequences in their own proper time even as flowers and fruits, without extraneous efforts of any kind, never fail to appear when their proper time comes.