How does surrendering with an undivided heart lead to spiritual growth?

According to the teachings in Chapter 19, a devotee who surrenders with an undivided heart is promised a direct experience of the Guru's power. The text advises that one should "witness the wonder of devotion" and "daily experience the new marvels of Sai's skill" through this complete surrender. This approach is not passive; one must be alert for the sake of the task. The process of surrender also involves nurturing good thoughts, such as those that arise upon waking. As Chapter 19 describes, nourishing these thoughts leads to great satisfaction, intellectual development, and a pleasant state of mind, confirming the sayings of the saints through personal experience.