Miguel Ruiz writes spiritual self-help drawing on ideas he presents as Toltec wisdom. The Four Agreements organises its advice around four principles: being careful with one's word, not taking things personally, avoiding assumptions and doing one's best. The Mastery of Love applies related ideas to relationships, fear and self-acceptance, while later books expand the framework through additional agreements and spiritual commentary. Ruiz's writing is simple, repetitive and parable-like rather than research-based psychology or historical scholarship on Mesoamerican religion. His work fits spiritual self-help, personal growth and relationship reflection, and is best approached as a modern spiritual framework rather than as an academic account of historical Toltec culture. The Four Agreements is the central text in Ruiz's catalogue and the clearest guide to the simple, principle-based style used throughout his later books. Read more Less