In Chapter 15, Poem 17 of Attar's Mokhtar Nameh, the poet emphasizes the crucial need for continuous spiritual and intellectual development. He warns that a heart that does not grow daily falls into an uncertain and lamentable state. Furthermore, Attar employs the metaphor of 'thought' as a 'wet-nurse' (دایهٔ فکر) tasked with nurturing the 'intellect' (عقل). Without the deliberate cultivation provided by contemplation, human intellect remains in a state of spiritual infancy, entering and leaving the world without achieving maturity or fulfilling its existential purpose.