वज्सारमयं नूनं हृदयं सुदृढे मम
vajrasāramayaṃ nūnaṃ hṛdayaṃ sudṛḍhe mama
वज्रसारमयं नूनं हृदयं सुदृढं मम; यदहं भीषणान्येतान् युद्धवृत्तान्तान् सहामि पुनश्च कथयामि।
संजय उवाच
The line highlights the moral-psychological cost of war: even a truthful witness and narrator must cultivate extreme inner hardness to endure the sight and retelling of mass suffering. It implicitly critiques the dehumanizing pressure that prolonged violence places on the heart.
In Drona Parva, Sañjaya continues reporting the battlefield events to Dhṛtarāṣṭra. Overwhelmed by the horrors he has seen and must describe, he remarks that his heart seems ‘adamantine’ to remain steady while witnessing and narrating such devastation.