Based on Chapter 50, what is the relationship between a devotee's effort and the Guru's grace in achieving spiritual progress?

Chapter 50 uses a powerful metaphor to explain the symbiotic relationship between a devotee's effort and the Guru's grace. The text compares the devotee's mind to a well-plowed land where the seed of faith has been sown. However, it poses a crucial question: if the 'Cloud of Grace'—representing the Guru—does not rain, will a crop be produced? This implies that while a devotee must prepare the ground through faith and attentive listening, spiritual growth is impossible without the Guru's divine intervention. Chapter 50 reinforces this by stating that the book itself is a product of Sai revealing it through grace, emphasizing that both the devotee's readiness and the Guru's compassion are essential for spiritual attainment.