Even if you reach me, oh, my heart, know that the stain of the flame has now reached my very soul.

This profound couplet speaks of irreversible pain. The speaker is essentially saying, 'Even if you finally reach me, who is already lost and directionless, by that time, the mark of suffering (the stain) has already settled deep within my heart.' It suggests that the suffering is not external; it has become an intrinsic part of the self. It's a beautiful, heartbreaking surrender to fate and love's devastating power.