Varṇa-dharma and Rājadharma: Yudhiṣṭhira’s Inquiry and Bhīṣma’s Normative Outline (वर्णधर्म-राजधर्म-प्रश्नोत्तरम्)
एवमस्त्विति वैन्यस्तु तैरुक्तो ब्रह्म॒वादिभि: । पुरोधाश्चाभवत् तस्य शुक्रो ब्रह्ममयों निधि:,उनके ऐसा कहनेपर उन वेदवादी महर्षियोंने उनसे इस प्रकार कहा, 'एवमस्तु"। फिर शुक्राचार्य उनके पुरोहित हुए, जो वैदिक ज्ञानके भण्डार हैं
evam astv iti vainyas tu tair ukto brahmavādibhiḥ | purodhāś cābhavat tasya śukro brahmamayo nidhiḥ ||
Bhīṣma said: Thus addressed by those sages who were exponents of the Veda, Vainya assented, saying, “So be it.” Thereafter Śukra became his royal priest—himself a treasury of sacred knowledge—signaling that kingship is to be guided and restrained by brahmanical counsel and Vedic wisdom rather than mere power.
भीष्म उवाच
Legitimate rule is strengthened when the king accepts guidance from Vedic sages and appoints a learned purohita; assent to dharmic counsel (“evam astu”) marks humility and alignment of power with sacred law.
Vainya agrees to the proposal or instruction given by the brahmavādins, and as a consequence Śukra is appointed as his purohita, described as a repository of Vedic wisdom.