This section of the book is from the "Handbook of Nature Cure Volume One: Nature Cure vs. Medical Science" book, by John L. Fielder.
According to our idea, if during an illness, the impurities stirred into the circulation are not allowed free exit from the system, the usual result is that they become deposited somewhere in the body. Some part or organ is chosen where the dumped materials won’t kill the person—but that means future trouble. The best way would be to spit them out, cough them out, or otherwise get them quickly into the open air. So, if some time in the future impurities begin seeking their way out of your body, you should encourage their effort, not "do something" or "take something" to prevent their elimination. Otherwise, some months later, a joint or other part of the body is likely to manifest stiffness or develop pain where the impurities have been stored away. After that disability becomes established you become aware of an aching back or a rash on the skin, or a stiff knee joint, but in every other way you feel better.
That is what we mean when we say that people feel better because of their rheumatism, or their coughs and their boils.
The next point to note is that no matter how small and insignificant any lesion may be, always the whole body is involved; nothing is ever a local condition only. As people lose their rheumatism, back come the coughs, or the headaches they had previous to the rheumatism, but always in a more intense form, if for a shorter time.