Mahabharata 12.309.79

सोपानभूतं स्वर्गस्य मानुष्यं प्राप्य दुर्लभम्तथात्मानं समादध्याद्भ्रश्येत न पुनर्यथा

sopānabhūtaṃ svargasya mānuṣyaṃ prāpya durlabhamtathātmānaṃ samādadhyādbhraśyeta na punaryathā

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