How does Chapter 41 illustrate the principle that Guru's grace can accomplish what great effort cannot?

Chapter 41 illustrates the power of Guru's grace by juxtaposing philosophical teaching with a real-life narrative. The chapter first makes the profound statement that which "cannot be attained even by great effort is set in motion by the power of the Guru’s grace." It then presents the story of Sai's portrait as a perfect demonstration of this principle. The narrator had a deep desire, initiated by a dream from Sai about coming for a Holi meal. The unexpected arrival of the physical portrait, brought by Alli Mohammed at the precise moment of the Holi lunch, is shown as a miraculous fulfillment of this desire, a 'Leela' that occurred not through the devotee's striving but through the timely and benevolent intervention of the Guru.