Mbh 12.270.1c

The sacrifices of these men, their (knowledge of the) Vedas, their acts performed in obedience to the ordinances, their study of the scripture at the fixed hours, and the wishes they entertained, freed as they were from lust and wrath, observant as they were of pious conduct and acts notwithstanding all difficulties, renowned as they were for performing the duties of their own order and mode of life, purified as their souls were in consequence of their very nature, characterised as they were by thorough sincerity, devoted as they were to tranquillity, and mindful as they were of their own practices, were identical with Infinite Brahma. Even this is the eternal Sruti heard by us.[1263] The penances of men that were so high-souled, of men whose conduct and acts were so difficult of observance and accomplishment, of men whose wishes were crowned with fruition in consequence of the strict discharge of their duties, became efficacious weapons for the destruction of all earthly desires. The Brahmanas say that that Good Conduct, which is wonderful, whose origin may be traced to very ancient times, which is eternal and whose characteristics are unchangeable, which differs from the practices to which even the good resort in seasons of distress and represents their acts in other situations, which is identical with heedfulness, over which lust and wrath and other evil passions can never prevail, and in consequence of which there was (at one time) no transgression in all mankind, subsequently came to be distributed into four subdivisions, corresponding with the four modes of life by persons unable to practise its duties in minute detail and entirety.[1264] They that are good, by duly observing that course of Good Conduct after adoption of the Sannyasa mode of life, attain to the highest end. They also that betake themselves to the forest mode reach the same high end (by duly observing that conduct).