Mbh 13.145.4

"'"'Maheswara said, "Those men that always enquire, about what is for their benefit and what is to their detriment, Brahmanas learned in the Vedas, crowned with success, and conversant with all duties, that avoid all kinds of evil deeds and achieve only such deeds as are good, succeed in ascending to Heaven after departing from this world and enjoy great happiness as long as they live here. Indeed, upon the exhaustion of their merit when they take birth in the order of humanity, they become born as men possessed of great intelligence. Every kind of felicity and auspiciousness becomes theirs in consequence of that intelligence with which they are born. Those men of foolish understandings who cast wicked eyes upon the wedded spouses of other men, become cursed with congenital blindness in consequence of that sinfulness of theirs. Those men who, impelled by desire in their hearts, cast their eyes on naked women, those men of wicked deeds take birth in this world to pass their whole lives in one continuous disease. Those men of foolish and wicked deeds who indulge in sexual congress with women of orders different from their own,--those men of little wisdom,--have to take birth in their next lives as persons destitute of virility. Those men who cause animals to be slain, and those who violate the beds of their preceptors, and those who indulge promiscuously in sexual congress, have to take birth in their next lives as persons destitute of the virile power."