I have found in this book all what it takes to excel in my profession. I recommend it to everyone because it was not only written for sellers but for everyone because when you try to convince your children or a family member of the merits of an idea, you sell them this idea ... When you try to convince your employer you increase, you will also sell for example ... I love this author because he showed such frankness and consistency with the principles of wealth in all its written ... And the principles outlined in this book are still valid today, as what the author really knew dissect human nature ...