A number of years ago I found the book The Four Agreements by Don Miguel Ruiz. Published in 1997, this small book is a great wake-up call and reminder for those of us who get stuck in old ways of thinking or in accepting other people's truths rather than our own. Really, anyone even those who are well-adjusted find great insights and pieces of wisdom in this book.
Ruiz's books are based on ancient Toltec wisdom and in the traditions of the Toltec a nagual (shaman) guides an individual to personal freedom. Ruiz is a nagual from the Eagle Knight lineage and he has dedicated his life to sharing the wisdom of the ancient Toltec.