More than anything, Wallace Wattles? books are an exercise in thinking. He brings forth techniques for controlling our thoughts in order to create and achieve what we desire in life, be it wealth, or health. He explains that most people are not able to achieve what they truly desire, because they do not know how to use the power of their thoughts. They have only a vague and misty concept of the things they want to do, to have, or to become.
The philosophy is pretty simple: It is not enough that you should have a general desire for health. The more clear and definite you make your picture then, and the more you dwell upon it, bringing out all its delightful details of what you will be able to do when you are strong and healthy, the stronger your desire will be; and the stronger your desire, the easier it will be to hold your mind fixed upon the picture of what you want.
Something more is necessary, however, than merely to see the picture clearly. Behind your clear vision must be the purpose to realize it; to bring it out in tangible expression. And behind this purpose must be an invincible and unwavering FAITH that the thing is already yours; that it is "at hand" and you have only to take possession of it.
Live in your new healthy, strong body mentally, until it takes form around you physically. In the mental realm, enter at once into full enjoyment of the things you want. See the health you want as if it were actually around you all the time; see yourself as living with it, using it. In imagination, live as you never have, pain-free just as you will use them when they are your tangible possessions. Dwell upon your mental picture until it is clear and distinct, and then take the Mental Attitude of Ownership toward everything in that picture. Take possession of it, in mind, in the full faith that it is actually yours. Hold to this mental ownership; do not waiver for an instant in the faith that it is real.