In Poem 20 from Chapter 18 of Attar's Mokhtar Nameh, the poet employs the recurring metaphor of the 'bird of the heart' (مرغ دل) to represent the restless human soul experiencing spiritual displacement. The poem illustrates that neither the soul nor the heart can find their true, nourishing path within the confines of the material world. Its central message is the necessity of returning to the divine source, asserting that the 'frantic bird' of the heart will only achieve peace when it finally locates its original, spiritual home.