Once more to quote Hahnemann's Organon:
There must be a curative principle present in medicine; reason divines as much. But its inner nature is in no way to be perceived by us; its mode of expression and its outward effects alone can be judged by experience.
Health is restored after the removal of all symptoms; then and only then is all disease removed. Hahnemann this way distinguishes between disease itself and its causes, manifestations, and products, and then shows at once that the sphere of homoeopathy is limited to functional changes from which the phenomena of diseases arise. Thus homoeopathy operates only in the dynamic sphere. Directly, homoeopathy has nothing in common with the physical cause or product of disease, but secondarily it is related. Here is the place where surgery may have its function, yet many of the tangible effects may remain. If these effects are too far advanced, they may be removed. If this is not done, it stands to reason that the best effects of the remedy will not be realized, but we must differentiate between the causes of disease and the ultimates of disease; they stand at opposite ends of the scale. While these ultimates are not primarily within the range of similar, and therefore not the objective of homeopathic treatment, the morbid process from which they arise or to which they lead is under the control of homoeopathic medication. This medication may control and retard the development of pathological conditions. Thus tumours may be retarded or completely arrested, and absorption increased, and finally the disappearance of the growth; secretions or excretions increased or decreased; ulcers healed; but all this is secondary to the real cure which takes place solely in the dynamic sphere, restoring the patient to health and harmonious functioning of his whole being by the dynamic influence of the symptomatically similar remedy.