When the black-rimmed spectacles are protected from that fire's heat, when someone burns the body and mind like I have done.

This profound couplet speaks to the overwhelming nature of emotional pain. Mir Taqi Mir suggests that no physical suffering, no matter how intense (like being exposed to fire), can compare to the agony of a heart that has been emotionally consumed. The pain inflicted by a loved one, who burns your soul and mind, is infinitely worse than any physical wound.