In Chapter 18, Poem 7 of Attar's Mokhtar Nameh, the poet contrasts the limited, entangled nature of the human intellect with the spiritual potential of the heart. The poem asserts that spiritual mysteries cannot be unlocked by the intellect, which only seeks entanglement and fails to untie the 'knot' of existence. Instead, spiritual realization requires the 'bird of the heart' to spread its wings, symbolizing the necessity of transcending rational thought in favor of intuitive, mystical awakening.