Mahabharata 12.52.18

सत्त्वस्थं च मनो नित्यं तव भीष्म भविष्यतिरजस्तमोभ्यां रहितं घनैर्मुक्त इवोडुराट्

sattvasthaṃ ca mano nityaṃ tava bhīṣma bhaviṣyatirajastamobhyāṃ rahitaṃ ghanairmukta ivoḍurāṭ

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