The Law of Similars · Similia Similibus
Organon Aphorism §27
The curative power of medicines, therefore, depends on their symptoms, similar to the disease but superior to it in strength (§ 12 – 26), so that each individual case of disease is most surely, radically, rapidly and permanently annihilated and removed only by a medicine capable of producing (in the human system) in the most similar and complete manner the totality of its symptoms, which at the same time are stronger than the disease.
Samuel Hahnemann, Organon of Medicine, 6th edition (Boericke translation, public domain).
Explanation
The simillimum — the remedy whose symptom picture most closely resembles the patient's totality — cures because its artificial disease is stronger than the natural disease. The vital force turns its attention to the stronger (medicinal) stimulus and, in overcoming it, overcomes the weaker natural disease as well.
Clinical Interpretation
This is the law of similars: like cures like. Find the remedy whose proving picture mirrors the patient's totality, and cure follows inevitably — not by theory but by natural law.
Modern Context
The immunological principle of like-cures-like has parallels in allergen desensitization therapy, vaccines (introducing similar antigens to build immunity), and hormetic conditioning.
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