This section is from the "Nature Cure: Philosophy and Practice Based on the Unity of Disease and Cure" book, by Henry Lindlahr.
I have formulated the Law of Action and Reaction in its application to the treatment of diseases as follows:
"Every agent affecting the human organism has two effects: a first, apparent, temporary one and a second, lasting one. The second effect is directly opposite to the first."
Allopathy, in giving large, physiological doses, takes into consideration only the first, apparent effect of the drug, and thereby accomplishes in the long run results directly opposite to those which it desires to bring about. It produces the very conditions it tries to cure. As an example, note the permanent effects of laxatives, stimulants and sedatives upon the system. This has been explained more fully in Chapter VI.
On the other hand, the homeopathic physician may use the same remedies as the allopath, provided they produce symptoms similar to those of the disease, but he administers the different drugs in such minute doses that their first effect is noticed only as a slight "homeopathic aggravation," while their second and lasting effect is relied upon to relieve and cure the disease.
In other words, homeopathy produces as the first effect the condition like the disease, and counts on the second and lasting effect of the drug to bring about a permanent change.
If, in accordance with the Law of Dual Effect as applied to drugs, the primary, temporary effect of the homeopathic remedy is equal to the disease, it is self-evident that the secondary, lasting effect of the remedy must be equal to the cure.
This law has been proved by homeopathy for over a hundred years. An experienced homeopathic prescriber would no more doubt it than he would doubt the Law of Gravitation.