What is the ultimate spiritual gift a devotee asks from Sai Baba in Chapter 26, and how is it to be achieved?

The ultimate spiritual gift requested in Chapter 26 is the direct, personal experience of self-knowledge, leading to the natural state of union, or 'Sayujya.' The author recognizes that mere intellectual understanding or 'exhaustion of speech' is fruitless in spirituality without direct experience. The path to achieving this, as outlined in the chapter, is through the Guru's grace. It requires the devotee to have unshakeable faith, surrender their ego and body-consciousness completely at the Guru's feet, and pray for an inward-turned intellect capable of discriminating between the eternal and the temporary. The devotee asks Baba to grant this experiential knowledge through His own power, acknowledging the Guru as the sole bestower of this profound realization.