It is not now, 'Mir', that the chest burns, having consumed all the heart, oh stain.

This couplet is a profound commentary on the nature of pain. When the poet says the burning chest is no longer the source of pain, he is describing a deeper, more chronic suffering. The 'daagh' (stain or scar) hasn't just hurt the surface; it has eaten away at the very core of his existence—his heart (jigar). It signifies a pain that is internalized, permanent, and devastatingly deep. It’s the pain of the soul, not just the skin.