Devibhagavatapurana 11.1.14

11.1.14

sarvadharmavariṣṭho'yamācāraḥ paramaṃ tapaḥ |
tadeva jñānamuddiṣṭaṃ tena sarvaṃ prasādhyate ||

Right way of living is the best of all the Dharmas and is great Tapasyâ (asceticism). The knowledge comes from this Right Living. Everything is attained thereby. He who is devoid of Sadâchâra, is like a S’ûdra, even if he comes of a Brâhmin family. There is no distinction whatsoever betwen him and a S’ûdra. Right conduct is of two kinds:-- (1) as dictated by the S’âstras, (2) as dictated by the popular custom (Laukika). Both these methods should be observed by him who wants welfare for his Self. He is not to forsake one of them. O Muni! The village Dharma, the Dharma of one's own caste, the Dharma of one's own family and the Dharma of one's own country all should be observed by men. Never, never he is to do anything otherwise. With great loving devotion that is to be preserved. Men who practise wrong ways of living, are censured by the public; they always suffer from diseases. Avoid wealth and desires that have no Dharma in them. Why? If in the name of dharma, painful acts (e. g. killing animals in sacrifices) are to be committed, those are blamed by the people; so never commit them. Avoid them by all means. Nârada said:-- “O Muni! The S’âstras are not one, they are many and they lay down different rules and contradictory opinions, How then Dharma is to be followed? And according what Dharma S’âstra?” Nârâyana said:-- S’ruti and Smriti are the two eyes of God; the Purânam is His Heart. Whatever is stated in S’ruti, the Smriti and the Purânams is Dharma; whatever else is written in other S’âstras is not Dharma. Where you will find differences between S’ruti, Smriti and Purânas, accept the words of the S’rutis as final proofs. Wherever Smriti disagrees with the Purânas, know the Smritis more authoritative.
And where differences will crop up in the S’rutis themselves, know that Dharma, too, is of two kinds. And where the differences will crop up in the Smritis themselves, consider, then, that different things are aimed at. In some Purânas, the Dharma of the Tantras is duly described; but of these, which go against the Vedas, they are not to be accepted any means.