What is the meaning behind the mother tortoise analogy that Baba uses when talking about his Guru?

The mother tortoise analogy is a powerful metaphor Sai Baba uses in Chapter 19 to explain the nature of his Guru's grace and protection. He describes how a mother tortoise on one bank of a river can nourish her young on the opposite bank merely with her loving gaze. Baba applies this to his own experience, stating, "Just as a mother tortoise feeds her young with her sight alone, such was the way of my Guru; he protected his child with his gaze." This illustrates that the Guru's grace is not dependent on physical proximity or verbal communication, like giving a mantra. The Guru's loving, merciful glance is sufficient to provide spiritual nourishment, bliss, and protection, making the disciple's anxious striving for a specific instruction, or 'upadesh', a useless effort.