In the Thirteenth Discourse of Farid al-Din Attar's Elahi Nameh, the fourth son approaches his father with his ultimate worldly desire: to find the Water of Life (Aab-e Hayat). He expresses an intense, burning thirst for this mystical water, claiming he can neither eat nor sleep until he attains it, as he believes it is his only path to salvation. This allegorical request symbolizes the human ego's longing for physical immortality and endless worldly existence, setting the stage for the father's spiritual counsel on the true, transcendent nature of eternal life.