Mahabharata 12.310.7
तपोमूलमिदं सर्वं यन्मां पृच्छसि पाण्डवतदिन्द्रियाणि संयम्य तपो भवति नान्यथा
tapomūlamidaṃ sarvaṃ yanmāṃ pṛcchasi pāṇḍavatadindriyāṇi saṃyamya tapo bhavati nānyathā
Our plain-language meaning of this verse is waiting for scholar review.
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