Mahabharata 12.294.17

न चाभिमन्यते किंचिन्न च बुध्यति काष्ठवत्तदा प्रकृतिमापन्नं युक्तमाहुर्मनीषिणः

na cābhimanyate kiṃcinna ca budhyati kāṣṭhavattadā prakṛtimāpannaṃ yuktamāhurmanīṣiṇaḥ

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