Mahabharata Anushasna Parva Chapter 145:3

Mahabharata Anushasna Parva (Dana Dharma Parva) Chapter 145:3 If in course of time he takes birth in the order of humanity, he is obliged to be born in a low and wretched race or family that is afflicted with impediments of every kind on every side. He becomes an object of aversion to all the world. Wretched among men, he becomes so through the consequence of his own acts. Another, who is possessed of compassion, casts his eye on all creatures. Endued with a friendly vision, behaving towards all creatures as if he were their father, divested of every hostile feeling, with all his passions under complete control, he never vexes any creature and never inspires them with fear by means of his hands or feet which are always under his control. He inspires the confidence of all beings. He never afflicts any creature with either cords or clubs or brick-bats or clods of hard earth or weapons of any kind. His deeds are never fierce or cruel, and he is full of kindness. One who is endued with such practices and conduct certainly ascend to Heaven. There he lives like a god in a celestial mansion abounding with every comfort. If, upon the exhaustion of his merit, he has to take birth in the order of humanity, he becomes born as a man that has not to fight with difficulties of any kind or to encounter any fear. Indeed, he enjoys great happiness. Possessed of felicity, without the obligation of undergoing distressing labour for his subsistence, he lives freed from every kind of anxiety. Even this, O goddess, is the path of the righteous. In it there are no impediments or afflictions." 'Uma said, "In the world some men are seen well-versed in inferences and the premises leading to them. Indeed, they are possessed of science and knowledge, have large progeny, and are endued with learning and wisdom. Others, O god, are destitute of wisdom, science, and knowledge, and are characterised by folly. By what particular acts does a person become possessed of wisdom? By what acts, again, does one become possessed of little wisdom and distorted vision? Do thou dispel this doubt of mine, O thou that art the foremost of all beings conversant with duties. Others there are, O god, that are blind from the moment of their birth. Others there are that are diseased and afflicted and impotent. Do thou, O god, tell me the reason of this." '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.