This section is from the book "The Chronic Diseases, Their Specific Nature And Their Homeopathic Treatment", by Samuel Hahnemann. Also available from Amazon: The chronic diseases, their specific nature and their homeopathic treatment.
Now if, as experience teaches, not even the fresh itch disease which is the most easy to cure of all, i. e., the internal, recently formed Psora together with the external, recent eruption, can be thoroughly healed by external applications accompanied by large quantities of flowers of Sulphur, it may easily be seen, that the Psora, after it has been deprived of its eruption and has become merely internal and inveterate, having developed secondary ailments and thus having changed into chronic diseases of various kinds, for the same reason can be just as little cured by a quantity of Sulphur flowers, or by a number of baths in sulphurous mineral waters, or on the other hand, by simultaneously drinking the same or a similar water; in a word, it cannot be cured by a superabundance and frequent repetition of this remedy, although it is of itself anti-psoric.* It is true that many such chronic symptoms of the medicine a, b, g, which is substituted for the group of symptoms belonging to the disease, merely because the medicine is used in an extraordinarily small dose. Should the homoeopathic physician give the patient too large a dose of the homoeopathic remedy indicated, the disease x, y, z, may, indeed, be transformed into the other, i. e., into a, b, g, but the new disease now sits just as firmly fixed as the former x, y, z; so that the organism can just as little free itself from the disease a, b, g, as it was able to throw off the original disease x, y, z. If a very large dose is given, then a new, often very dangerous disease is produced, or the organism does its utmost to free itself very quickly from the poison (through diarrhoea, vomiting, etc.)."
* Used in small doses, Sulphur as one of the anti-psoric remedies will not fail to make a brief beginning of a cure of the chronic (non-venereal and therefore psoric) diseases. I know a physician in Saxony who gained a great reputation by merely adding to his prescription in nearly all chronic diseases flowers of Sulphur, and this without knowing a reason for it. This in the beginning of such treatments is wont to produce a strikingly beneficent effect, but of course only in the beginning, and therefore after that his help was at an end.
Thus we see that either the excessive use of Sulphur in all its forms, or the frequent repetition of its use by allopathic physicians in the treatment of a multitude of chronic diseases (the secondary psoric ailments) have taken away from it all value and use; and we may well assert that, to this day, hardly anything but injury has been done by allopathic physicians through the use of Sulphur.
But even supposing that anyone should desire to make the only correct use of Sulphur in this kind of disease, it will seldom be possible to do this with the same desired success as where the homoeopathic physician finds a recent case of the itch-disease with its still existing eruption. Even when, owing to its undeniable antipsoric effects, Sulphur may be able of itself to make the beginning of a cure, after the external expulsion of the eruption, either with the still hidden and latent Psora or when this has more or less developed and broken out into its varied chronic diseases, it can nevertheless be but rarely made use of for this purpose, because its powers have usually been already exhausted because it has been given to the patient already before by allopathic physicians for one purpose or another, perhaps has been already given repeatedly; but Sulphur, like most of the antipsoric remedies in the treatment of a developed Psora that has become chronic, can hardly be used three or four times (even after the intervening use of other antipsoric remedies) without causing the cure to retrograde.
The cure of an old Psora that has been deprived of its eruption, whether it may be latent and quiescent or already broken out into chronic diseases, can never be accomplished with Sulphur alone, nor with sulphur-baths, either natural or artificial.
Here I may mention the curious circumstance that in general - with the exception of the recent itch-disease still attended with its unrepressed cutaneous eruption, and which is so easily cured from within* - every other psoric diathesis, i. e., the Psora that is still latent within, as well as the Psora that has developed into one of the innumerable chronic diseases springing from it, is very seldom cured by any single antipsoric remedy, but requires the use of several of these remedies - in the worst cases the use of quite a number of them - one after the other, for its perfect cure.