Can Sai Baba help with both worldly and spiritual matters? What is required from the devotee?

Yes, according to the teachings in Chapter 33, Sai is fully capable of granting the desires of his devotees, whether those desires are worldly or spiritual in nature. The text explicitly states, 'whoever is a devotee of undivided faith, whoever desires whatever purpose, whether worldly or spiritual, Sai is capable of granting the fruit.' The key requirement from the devotee is 'undivided faith.' The stories of Haribhau Karnik and Appasaheb illustrate this principle. Baba orchestrates events, even appearing as a different saint or a Fakir, to interact with his devotees and fulfill the underlying currents of their devotion. This demonstrates that for a devotee with unwavering faith, Sai provides for all needs and desires.