Another thing. We assert that this book gives in detail the principles of the science of getting rich, and if that is true, you do not need to read any other book upon the subject. This may sound narrow and egotistical, but consider: There is no more scientific method of computation in mathematics than by addition, subtraction, multiplication, and division; no other method is possible. There can be but one shortest distance between two points. There is only one way to think scientifically, and that is to think in the way that leads by the most direct and simple route to the goal. No one has yet formulated a briefer or less complex “system” than the one set forth here. It has been stripped of all non-essentials. When you commence on this, lay all others aside. Put them out of your mind altogether. Read this book every day. Keep it with you. Commit it to memory, and do not think about other “systems” and theories. If you do, you will begin to have doubts and to be uncertain and wavering in your thought, and then you will begin to make failures.  

After you have made good and become rich, you may study other systems as much as you please. And read only the most optimistic comments on the world’s news — those in harmony with your picture. Also, do not dabble in theosophy, spiritualism, or kindred studies. Perhaps the dead still live and are near, but if they are, let them alone; mind your own business. Wherever the spirits of the dead may be, they have their own work to do, and we have no right to interfere with them. We cannot help them, and it is very doubtful whether they can help us, or whether we have any right to trespass upon their time if they can. Let the dead and the hereafter alone, and solve your own problem: Get rich.