Mahabharata 1.33.8

अपि मन्त्रयमाणा हि हेतुं पश्याम मोक्षणेयथा नष्टं पुरा देवा गूढमग्निं गुहागतम्

api mantrayamāṇā hi hetuṃ paśyāma mokṣaṇeyathā naṣṭaṃ purā devā gūḍhamagniṃ guhāgatam

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