Mbh 12.260.1a

"'Yudhishthira said, "Thou sayest that righteousness or duty depends upon delicate considerations, that is indicated by the conduct of those that are called good, that it is fraught with restraints (from numerous acts), and that its indications are also contained in the Vedas. It seems to me, however, that I have a certain inward light in consequence of which I can discriminate between right and wrong by inferences.[1127] Numerous questions that I had intended to ask thee have all been answered by thee. There is one question, however, that I shall presently ask. It is not prompted, O king, by desire of empty disputation. All these embodied creatures, it seems, take birth, exist, and leave their bodies, of their own nature. Duty and its reverse, therefore, cannot be ascertained, O Bharata, by study of the scriptures alone.[1128] The duties of a person who is well off are of one kind. Those of a person who has fallen into distress are of another kind. How can duty respecting seasons of distress be ascertained by reading the scriptures alone?[1129] The acts of the good, thou hast said, constitute righteousness (or duty). The good, however, are to be ascertained by their acts. The definition, therefore, has for its foundation, a begging of the question, with the result that what is meant by conduct of the good remains unsettled. It is seen that some ordinary person commits unrighteousness while apparently achieving righteousness. Some extraordinary persons again may be seen who achieve righteousness by committing acts that are apparently unrighteous.[1130] Then, again, the proof (of what I say) has been furnished by even those that are well conversant with the scriptures themselves, for it has been heard by us that the ordinances of the Vedas disappear gradually in every successive age. The duties in the Krita age are of one kind. Those in the Treta are of another kind, and those in the Dwapara are again different.