एतद्ध स्म वै तद्विद्वांस आहुः पूर्वेमहाशाला महाश्रोत्रिया न नोऽद्य क-श्चनाश्रुतममतमविज्ञातमुदाहरिष्यतीतिह्येभ्यो विदांचक्रुः ॥ ७ ॥
In plain words
This is what ancient masters, great householders and profound scholars of the Veda, used to declare: 'Today no one can bring forth anything before us that is unheard, unthought, or unknown,' because through this knowledge they understood everything.
Close to the Sanskrit
This indeed former knowers, great householders and great Vedic scholars, have said: 'Today no one will propound to us anything unheard, unthought, or uncomprehended,' for from these they knew.