What is the significance of the oil-press peg analogy mentioned in relation to devotion?

In Chapter 29, the analogy of the oil-press peg serves as a powerful metaphor for how Sai Baba refines a devotee's faith. The text states that just as a peg is 'shaken and then firmly fixed,' Sai refines devotion by 'shaking and then purifying.' This suggests that periods of instability, doubt, or challenge are not arbitrary. They are intentionally created to test and ultimately strengthen one's attachment. The 'shaking' removes impurities and weakness, allowing for a more solid and purified 'firm devotion to the Guru's feet' to be established in the end.