Castaneda introduced the general public to the teachings of Mexican shamans which originated in the Toltec tradition, guardian of the knowledge of Quetzacoatl, the feathered serpent. In this book, Don Miguel Ruiz reveals the source of limiting beliefs that deprive of joy and create unnecessary suffering. It shows in very simple terms how we can free ourselves from collective conditioning in order to rediscover the dimension of unconditional love which is at our origin and constitutes the foundation of the Toltec teachings. The four agreements offer a powerful code of conduct capable of quickly transforming our lives into an experience of freedom, true happiness and love. The fascinating world of true and embodied knowledge is finally within everyone's reach.