Organon §168

In this way, one will more easily find an analogue, from among the known medicines, that corresponds to this new disease image. Even just a single dose of this [second] medicine, while not entirely annihilating the disease, will bring the case much closer to cure. And so one continues along (if even this medicine is not fully sufficient to restore health) examining again and again the disease state that still remains and selecting a homeopathic medicine that is as fitting as possible for it until the intention to place the patient in full possession of health is reached.