How does the dissolution of ego function as a prerequisite for receiving Sai Baba's complete assistance?

As detailed in Chapter 2, the dissolution of the ego is the fundamental cause that unlocks Sai Baba's full assistance. Baba's instruction is for the devotee to 'dissolve his ego and surrender it at my feet.' The effect of this surrender is profound. When the ego is dissolved to the point that no trace of it remains, a space is created. It is into this space that Baba says, 'I myself shall enter with 'I-ness' and write with my own hand.' This shows that ego acts as a barrier. By removing it, the devotee becomes a pure instrument, allowing Baba to not only accomplish the work at hand, like writing the story, but also to 'serve in all ways in his home.'