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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.

No one at all, it would seem, except the physician can have this knowledge; and therefore not the wise man; he would have to be a physician as well as a wise man.

Very true.

Then, assuredly, wisdom or temperance, if only a science of science, and of the absence of science or knowledge, will not be able to distinguish the physician who knows from one who does not know but pretends or thinks that he knows, or any other professor of anything at all; like any other artist, he will only know his fellow in art or wisdom, and no one else.