What specific condition did Sai Baba set for a devotee to receive his complete assistance, and what did he promise in return?

The condition for receiving Sai Baba's full help, as described in Chapter 2, is the complete dissolution of one's ego and its surrender at His feet. To a person who successfully acts this way, Baba promises his full assistance. The promise is remarkably comprehensive; He says, "Not just this story, but I shall serve in all ways in his home." This act of surrender is the key, as Baba explains that when the ego is gone, He himself enters with 'I-ness' to accomplish the work, making the devotee an instrument of divine will.