Based on Chapter 18, how does the Guru tailor his teachings, and what is the effect of his grace on a devotee's perspective?

Chapter 18 explains that the Sadguru's method of instruction is highly personalized. He shows the "true path through instruction to each person according to their worthiness," without creating intellectual conflict. This implies a deep understanding of each devotee's capacity and needs. The chapter also describes the transformative effect of the Guru's grace. It states that if one is fortunate enough to fall within the Guru's grace, the "false logic of 'mine' and 'thine'" completely disappears, eliminating the dualistic thinking that separates one person from another.