All strength (wings) was lost within their very steps, and for their sake, the heart's throne became utterly empty.

This couplet beautifully captures the essence of complete devotion and surrender. It paints a picture where, in the presence or for the sake of a beloved, all one's aspirations and abilities, symbolized by 'wings,' simply fall away. And for that very person, the 'throne of the heart' becomes empty of all else. It's about how deeply one can be affected by another, to the point of losing oneself and having one's heart entirely consumed or emptied for that singular love or purpose.