And medicine is distinguished from other sciences as having the subject-matter of health and disease?
Yes.
And he who would enquire into the nature of medicine must pursue the enquiry into health and disease, and not into what is extraneous?
True.
And he who judges rightly will judge of the physician as a physician in what relates to these?
He will.
He will consider whether what he says is true, and whether what he does is right, in relation to health and disease?
He will.
But can any one attain the knowledge of either unless he have a knowledge of medicine?
He cannot.