Mahabharata 12.108.28

आभ्यन्तरं भयं रक्ष्यं सुरक्ष्यं बाह्यतो भयम्अभ्यन्तराद्भयं जातं सद्यो मूलं निकृन्तति

ābhyantaraṃ bhayaṃ rakṣyaṃ surakṣyaṃ bāhyato bhayamabhyantarādbhayaṃ jātaṃ sadyo mūlaṃ nikṛntati

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