Mahabharata 12.306.102
न स्वाध्यायैस्तपोभिर्वा यज्ञैर्वा कुरुनन्दनलभतेऽव्यक्तसंस्थानं ज्ञात्वाव्यक्तं महीपते
na svādhyāyaistapobhirvā yajñairvā kurunandanalabhate'vyaktasaṃsthānaṃ jñātvāvyaktaṃ mahīpate
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book