Mahabharata 8.5.34

वज्रसारमयं नूनं हृदयं सुदृढं ममयच्छ्रुत्वा पुरुषव्याघ्रं हतं कर्णं न दीर्यते

vajrasāramayaṃ nūnaṃ hṛdayaṃ sudṛḍhaṃ mamayacchrutvā puruṣavyāghraṃ hataṃ karṇaṃ na dīryate

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