"The Four Agreements: A Practical Guide to Personal Freedom" by Don Miguel Ruiz (MD) explores a philosophy rooted in ancient Toltec wisdom. The book presents four principles—speaking with integrity, avoiding personal offense, letting go of assumptions, and striving for excellence—as a path to greater freedom and self-awareness. Ruiz explains how these agreements can transform thought patterns and reduce mental barriers. Applying these concepts may lead to improved relationships, inner balance, and a more intentional way of living.