श्वेतकेतो यन्नु सोम्येदं महामना अनूचानमानी स्तब्धोऽस्युत तमादेशमप्राक्ष्यः येनाश्रुतं श्रुतं भवत्यमतं मतमविज्ञातं विज्ञातमिति कथं नु भगवः स आदेशो भवतीति ॥ ६.१.३ ॥
In plain words
"Śvetaketu, since thou art now high-minded, thinking thyself learned and stiff with pride, didst thou ask for that teaching by which the unheard becomes heard, the unthought thought, and the unknown known?" "How, sir, is that teaching?"