Mbh 12.235.1a

"'"Vyasa said, 'The knowledge called Trayi which occurs in the Vedas and their branches should be acquired. That knowledge is to be derived from the Richs, the Samans, and the sciences called Varna and Akshara. There are besides, the Yajuses and the Atharvans. In the six kinds of acts indicated in these, dwells the Divine Being. They that are well-versed in the declarations of the Vedas, that have knowledge of the Soul, that are attached to the quality of Goodness, and that are highly blessed, succeed in understanding the origin and the end of all things. A Brahmana should live in the observance of the duties laid down in the Vedas. He should do all his acts like a good man of restrained soul. He should earn his livelihood without injuring any creature. Having derived knowledge from the good and wise, he should control his passions and propensities. Well-versed in the scriptures, he should practise those duties that have been laid down for him, and do all acts in this world guided by the quality of goodness. Leading even the domestic mode of life, the Brahmana should be observant of the six acts already spoken of.[901] His heart full of faith, he should worship the deities in the five well-known sacrifices. Endued with patience, never heedless, having self-control, conversant with duties, with a cleansed soul, divested of joy, pride, and wrath, the Brahmana should never sink in languor. Gifts, study of the Vedas, sacrifices, penances, modesty, guilelessness, and self-restraint,--these enhance one's energy and destroy one's sins. One endued with intelligence should be abstemious in diet and should conquer one's senses. Indeed, having subdued both lust and wrath, and having washed away all his sins, he should strive for attaining to Brahma. He should worship the Fire and Brahmanas, and bow to the deities. He should avoid all kinds of inauspicious discourse and all acts of unrighteous injury. This preliminary course of conduct is first laid down for a Brahmana.