In Chapter 23, Poem 33 of Attar's Mokhtar Nameh, the poet reflects on the absolute and unchangeable nature of the divine decree of mortality. The poem characterizes death and the transition out of the earthly path as a terrifying and unavoidable 'difficult valley' (وادی صعب). Attar emphasizes that the realization of this inevitable fate should evoke profound existential anguish, metaphorically turning the heart to 'blood,' and asserts that only a heart of stone would remain indifferent to the terrifying reality of death.