language of Democritus, a varied and susceptible storehouse and treasury of what is bad, not flowing in from without, but having as it were innate and native springs, which vice, being exceedingly rich and abundant in passion, produces. And if diseases are detected in the body by the pulse and by pallors and flushes,2 and are indicated by heats and sudden pains, while the diseases of the mind, bad as they are, escape the notice of most people, the latter are worse because they deprive the sufferer of the perception of them. For reason if it be sound perceives the diseases of the body, but he that is diseased in his mind cannot judge of his sufferings, for he suffers in the very seat of judgement. We ought to account therefore the first and greatest of the diseases of the mind that ignorance,3 whereby vice is incurable for most people, dwelling with them and living and dying with them. For the beginning of getting rid of disease is the perception of it, which leads the sufferer to the necessary relief, but he who through not believing he is ill knows not what he requires refuses the remedy even when it is close at hand. For amongst the diseases of the body those are the worst which are accompanied by stupor, as lethargies, headaches, epilepsies, apoplexies, and those fevers which raise inflammation to the pitch of madness, and disturb the brain as in the case of a musical instrument,
§ iii. And so doctors wish a man not to be ill, or if he is ill to be ignorant of it, as is the case with all diseases of the soul. For neither those who are out of their minds, nor the licentious, nor the unjust think themselves faulty—some even think themselves perfect. For no one ever yet called a fever health, or consumption a good condition of body, or gout swift-footedness, or paleness a good colour; but many call anger manliness, and love friendship, and envy competition, and cowardice prudence.