I've come to know Andrew Matthews when I first read BEING HAPPY back in college, one of his most famous books. I have all three by the way including HAPPINESS IN HARD TIMES, FOLLOW YOUR HEART and MAKING FRIENDS. This particular one, HAPPINESS NOW, is like a summary of all those three. All the principles I learned about living a healthy, happy, prosperous life, achieving the career of your dreams, obtaining peace of mind, etc. --- all these things are put into several cohesive and creative nutshells for better and simpler understanding.
Basically, it taught me three things: