What was the most important thing a devotee needed to see Vitthal, according to Sai Baba?

According to a story in Chapter 4, the single most important requirement for a devotee to see Lord Vitthal was faith. When Das Ganu organized a Name-week (Saptah) and expressed his desire for Vitthal to manifest, Sai Baba gave him a firm assurance. Placing His hand on His chest, Baba told Das Ganu, "Yes, yes, the form of Vitthal will appear! But the devotee must be full of faith." This highlights that while rituals and devotion are important, it is unwavering faith that ultimately allows a devotee to experience the divine presence, reinforcing that Shirdi itself could be Pandharpur if one's belief was strong enough.