Mahabharata 12.296.39

अवाप्तमेतद्धि पुरा सनातना;द्धिरण्यगर्भाद्गदतो नराधिपप्रसाद्य यत्नेन तमुग्रतेजसं; सनातनं ब्रह्म यथाद्य वै त्वया

avāptametaddhi purā sanātanā;ddhiraṇyagarbhādgadato narādhipaprasādya yatnena tamugratejasaṃ; sanātanaṃ brahma yathādya vai tvayā

Our plain-language meaning of this verse is waiting for scholar review.