In Chapter 10, Poem 19 of Attar's Mokhtar Nameh, the 'bird of the heart' (مرغ دل) symbolizes the spiritual essence that must be empowered by the 'light of meaning' (نور معنی). The poem suggests that if the seeker embarks on the spiritual path, their inner being becomes a treasury of divine secrets. Furthermore, it warns that without cultivating these spiritual wings of meaning during worldly life, the soul will be unable to take flight upon the breaking of its physical 'cage' (the body), emphasizing the necessity of inner spiritual work before death.