Mahabharata 12.181.19

प्रजा ब्राह्मणसंस्काराः स्वधर्मकृतनिश्चयाःऋषिभिः स्वेन तपसा सृज्यन्ते चापरे परैः

prajā brāhmaṇasaṃskārāḥ svadharmakṛtaniścayāḥṛṣibhiḥ svena tapasā sṛjyante cāpare paraiḥ

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