Some patients prove every remedy they get; patients inclined to be hysterical, overwrought, oversensitive to all things. The patient is said to have an idiosyncrasy to everything, and these oversensitive patients are often incurable.
You administer a dose of a high potency, and they will go on and prove that medicine, and while under the influence of that medicine they are not under the influence of anything else. It takes possession of them, and acts as a disease does; the remedy has its prodromal period, its period of progress and its period of decline.
Such patients are provers, they will prove the highest potencies. When you find a patient that proves everything you give in the higher potencies go back to the 30th and 200th potencies. Such patients are most annoying. You will often cure their acute diseases by giving them the 30th and 200th, and you will relieve their chronic disease by giving them the 30th, 200th and 500th potencies.
Many of them are born with this sensitivity and they will die with it; they are not capable of rising above this over-irritable and over-wrought state. Such oversensitive patients are very useful to the homoeopathic physician. After they get out of one proving they are quite ready to repeat it or go into another.