Mahabharata 12.11.21

तपः श्रेष्ठं प्रजानां हि मूलमेतन्न संशयःकुटुम्बविधिनानेन यस्मिन्सर्वं प्रतिष्ठितम्

tapaḥ śreṣṭhaṃ prajānāṃ hi mūlametanna saṃśayaḥkuṭumbavidhinānena yasminsarvaṃ pratiṣṭhitam

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