Mahabharata 12.90.13

आत्मानं सर्वतो रक्षन्राजा रक्षेत मेदिनीम्आत्ममूलमिदं सर्वमाहुर्हि विदुषो जनाः

ātmānaṃ sarvato rakṣanrājā rakṣeta medinīmātmamūlamidaṃ sarvamāhurhi viduṣo janāḥ

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