What exactly is the 'supreme attainment' that Sai is said to gift to his devotees?

According to Chapter 1, the "supreme attainment" gifted by Sai is not merely an intellectual concept but a profound inner state. It is described as the personal experience of 'Brahman is truth' and the constant awareness that 'The world is an illusion'. However, the text clarifies that the essence of this attainment is the cultivation of a "joyful disposition," characterized by constant peace, joy, and satisfaction in the heart. Sai is presented as the very source of this joyful disposition. Therefore, as Chapter 1 explains, a devotee who has Sai is considered fortunate because they have achieved this internal state of unwavering, ocean-like fullness and supreme bliss.