Like Don Miquel Ruiz, author of the bestselling book "The Four Agreements," author Susan Gregg teaches readers how the ancient Toltec tradition can apply to life in the 21st century. For those who haven't watched Oprah lately, the Toltecs were an ancient race of people who flourished in Southern Mexico around 800 AD. "They were also a secret society dedicated to preserving the knowledge of the 'ancient ones,' who were great spiritual masters," according to Gregg. Gregg explains that the Toltec tradition is a way of seeing beyond our perceived sense of reality and into an unlimited world of possibility.