Mahabharata Anushasna Parva Chapter 162:2

Mahabharata Anushasna Parva (Dana Dharma Parva) Chapter 162:2 "'Yudhisthira said, "Tell me, O grandsire, which among these (four) is most authoritative, viz., direct perception, inference from observation, the science of Agama or scriptures, and diverse kinds of practices that distinguish the good." "'Bhishma said, "While Righteousness is sought to be destroyed by wicked persons possessed of great might, it is capable of being protected for the time being by those that are good exerting themselves with care and earnestness. Such protection, however, avails not in the long run, for destruction does overtake Righteousness at the end. Then, again, Righteousness often proves a mask for covering Unrighteousness, like grass and straw covering the mouth of a deep pit and concealing it from the view. Hear, again, O Yudhisthira! In consequence of this, the practices of the good are interfered with and destroyed by the wicked. Those persons who are of evil conduct, who discard the Srutis—indeed, those wicked wights who are haters of Righteousness,—destroy that good course of conduct (which could otherwise be set up as a standard). Hence, doubts attach to direct perception, inference, and good conduct.[] Those, therefore, among the good that are possessed of understanding born of (or cleansed by) the scriptures and that are ever contented, are to be regarded as the foremost. Let those that are anxious and deprived of tranquillity of soul, approach these. Indeed, O Yudhishthira, do thou pay court to them and seek of them the solutions of thy doubt![] Disregarding both pleasure and wealth which always follow cupidity and awakened into the belief that only Righteousness should be sought, do thou, O Yudhishthira, wait upon and ask those persons (for enlightening thyself). The conduct of those persons never goes wrong or meets with destruction, as also their sacrifices and Vedic study and rites. Indeed, these three, viz., conduct as consisting of overt acts, behaviour in respect of (mental) purity, and the Vedas together constitute Righteousness." "'Yudhishthira said, "O grandsire, my understanding is once more stupefied by doubt. I am on this side the ocean, employed in searching after the means of crossing it. I do not, however, behold the other shore of the ocean! If these three, viz., the Vedas, direct perception (or acts that are seen), and behaviour (or, mental purity) together constitute what is to be regarded as authority, it can be alleged that there is difference between them. Righteousness then becomes really of three kinds, although it is one and indivisible."