In this tale from Attar's Mosibat Nameh, Abu Sa'id Abul-Khayr identifies a watermill as a master of Sufism. The mill's characteristics serve as metaphors for the spiritual journey: constant internal travel while remaining physically stationary, the transformation of coarse input into soft output (symbolizing spiritual refinement), and a state of perpetual bewilderment (sar-gashtegi) in its circular motion. The allegory emphasizes that true spiritual progress is an internal transformation and a service to others, regardless of external worldly upheavals.