"Similia similibus curentur" (something similar should be cured with something similar). This is the famous motto of Samuel Hahnemann (1755-1843).
Discovery of the Hahnemann therapy
When Hahnemann translated William Cullen's "Materia Medica" in 1790, he came across his explanation of the effect of the cinchona bark on intermittent fever. He came up with the idea of taking some of the china bark in a self-experiment. To his great astonishment, he developed the symptoms of intermittent fever. Several repetitions of the experiment gave the same result each time.
In Hahnemann came to the realization that he had recognized a natural principle: namely, that a disease can be cured if you give a patient a drug that causes similar symptoms in healthy people!
What came afterwards?
Hahnemann took six years to publish his principle in a newspaper article for the first time in 1796 ("An attempt to find a new principle for finding the medicinal properties of medicinal substances, along with a few glimpses of the previous ones"). During these six years, he continuously watched, tested and experimented with his discovery. Because of this publication, the year 1796 today is considered the year of birth of homeopathy.
In the following years, Hahnemann developed the theory and practice of homeopathy further to a self-contained therapy. With almost every publication, Hahnemann's enemies intervened among the doctors, but also gained new friends and followers of his therapy. You could say that he split the medical world in half.