What effect does the Guru's grace have on a devotee's perception of the world, as stated in Chapter 18?

According to Chapter 18, receiving the Guru's grace has a profound and transformative effect on a devotee's perception. The text states that if, by a stroke of fortune, one falls within the Guru's grace, the 'false logic of "mine" and "thine"' finds no place. This means that the grace eliminates the devotee's sense of duality and separateness, where they no longer distinguish between 'ours' and 'a stranger.' This grace helps the seeker overcome the illusion of Maya and the obstacle of greed, leading them toward the knowledge of the Self and the truth of Brahman.