§ 213
We shall, therefore, never be able to cure conformably to nature – that is to say, homoeopathically – if we do not, in every case of disease, even in such as are acute, observe, along with the other symptoms, those relating to the changes in the state of the mind and disposition, and if we do not select, for the patient’s relief, from among the medicines a disease-force which, in addition to the similarity of its other symptoms to those of the disease, is also capable of producing a similar state of the disposition and mind.1
1 Thus aconite will seldom or never effect a rapid or permanent cure in a patient of a quiet, calm, equable disposition; and just as little will nux vomica be serviceable where the disposition is mild and phlegmatic, pulsatilla where it is happy, gay and obstinate, or ignatia where it is imperturbable and disposed neither to be frightened nor vexed.