What does Sai Baba's response to Dev's accusation of deceit reveal about His divine nature?

Sai Baba's response, as chronicled in Chapter 40, reveals several aspects of his divine nature. Firstly, his omniscience is evident when he states, "When the letter is opened before Me, the state of mind within the letter is already known and stands before Me in person." Secondly, instead of anger, he displays a teaching compassion, asking Jog to tell Dev, "You did not recognize Me! Why then did you call Me?" This puts the onus of perception on the devotee. Thirdly, he demonstrates his absolute adherence to truth and his promises, asserting that he would rather die than have his words fail. This entire interaction shows that Baba operates on a plane beyond ordinary human perception, using Maya not to deceive, but to teach and test the faith of his devotees.