This has been a life-changing book for me in so many ways. The Optimal Thinking concept, continues to prove itself to me on a daily basis - I have not had one instance in my life the last 3 years, since purchasing it, where it has failed me. The concept is timeless and it grows with you and your life. Optimal Thinking empowers me daily, on a second by second basis to be the best I can be, and to make the most of my life, regardless of the circumstances I find myself in. This is the best book I have ever purchased, and I do not state that lightly. I imagine, it will always remain the best book I have ever purchased, because it is that powerful. With the foundation of knowledge and understanding and the skills it imparts, it has become invaluable to me. It has also opened my eyes and my mind to numerous other things and has progressed my interests to many other topics and subjects. The return of investment from Optimal Thinking, for me, has been simply phenomenal. I serendipitously found Optimal Thinking and I am very glad I did. It actually is mental software for your mind. You will come to understand the power of what you have found within the very first chapter - I live my life to the fullest every day regardless of my circumstances - that's Optimal Thinking and it works.