When acts alone settle who is a Brahmana and who is not; acts must be held to point out the happiness or misery of a person. About those who have by conquering all evil passions acquired purity of heart, we have heard the eternal Shruti that, on account of the Infinity which they acquire and of the knowledge of Brahma (they acquire through the declarations of Shrutis), they see everything as Brahma. The duties followed by those pure-hearted men, who are shorn of desire, and who have Liberation only for their object, for acquisition of the knowledge of Brahma, are equally sanctioned for all the four castes and all the four modes of life. That knowledge is always gained by Brahmanas of pure hearts and controlled soul.
कमैवं पुरुषस्याह शुभं वा यदि वाशुभम्। एवं पक्वकषायाणामानन्त्येन श्रुतेन च।॥ सर्वमानन्त्यमासीद् वै एवं नः शाश्वती श्रुतिः। तेषामपेततृष्णानां निर्णिक्तानां शुभात्मनाम्॥ चतुर्थोपनिषद् धर्म: साधारण इति स्मृतिः। संसिद्धैः साध्यते नित्यं ब्राह्मणैर्नियतात्मभिः॥