Some may argue that there are only two emotions, Love and Fear. All other emotions are manifestations of these two. I am not going to go quite as far as to say that; but it does provide a great deal to think about deeply and the points of this simple little book are worth considering. Read, study, meditate/ponder on it, and then you decide.
If you are a religious person, I would even recommend you do searches of the religious writings you believe in and compare what is said in this book. The results may surprise you. I will also not say that I agree 100% with everything in this book; but I would come pretty close. You can probably get this or order it from your local library. You can also purchase it online through the link below.