Mbh 12.270.1d

They too that observe the domestic mode of life attain to the highest end (by duly practising the same conduct); and, lastly, those that lead the Brahmacharya mode obtain the same (end by a due observance of the same conduct).[1265] Those Brahmanas are seen to shine in the firmament as luminaries shedding beneficent rays of light all around. Those myriads of Brahmanas have become stars and constellations set in their fixed tracks. In consequence of contentment (or Renunciation) they have all attained to Infinity as the Vedas declare. If such men have to come back to the world through the wombs of living creatures, they are never stained by sins which have the unexhausted residue of previous acts for their originating cause. Indeed, one who has led the life of a Brahmacharin and waited dutifully upon his preceptor, who has arrived at settled conclusions (in respect of the soul), and who has devoted himself to Yoga thus, is truly a Brahmana. Who else would deserve to be called a Brahmana? When acts alone determine who is a Brahmana and who is not, acts (good or bad) must be held to indicate the happiness or misery of a person. As regards those that have by conquering all evil passions acquired purity of heart, we have heard the eternal Sruti that in consequence of the Infinity to which they attain (through beholding the universal soul) and of the knowledge of Brahma (they acquire through the declarations of Srutis), they behold everything to be Brahma. The duties (of tranquillity, self-restraint, abstention from acts, renunciation, devotion, and the abstraction of Samadhi) followed by those men of pure hearts, that are freed from desire, and that have Emancipation only for their object, for acquisition of the knowledge of Brahma, are equally laid down for all the four orders of men and all the four modes of life. Verily, that knowledge is always acquired by Brahmanas of pure hearts and restrained soul.