This book is considered one of the best-selling books in the world, whether for Carnegie's books or for human development books in general. It has sold more than twenty million copies around the world and has been translated into many languages. The book is considered a reference for human relations, and it contains a summary of the writer "Carnegie's" experiences in life. In this book, Carnegie tried to help the reader overcome the obstacle of fear of facing the public. This is through good preparation of the speech or speech and giving examples of those who became preachers and how the most famous preachers attended their sermons. He also called on every person who wants to be a preacher to work on improving his memory, explaining the basic elements of a successful speech, the secrets of good delivery, how to open a speech or sermon, how to conclude it, how to make what you mean clear, how to arouse the interest of your audience, and how to improve your style. It is a call to advance human capabilities.