Socrates. Amongst a number of persons employed in solving a problem of arithmetic, might not a person know, my dear Ion, which had given the right answer?
Ion. Certainly.
Socrates. The same person who had been aware of the false one, or some other?
Ion. The same, clearly.
Socrates. That is, some one who understood arithmetic?
Ion. Certainly.
Socrates. Among a number of persons giving their opinions on the wholesomeness of different foods, whether would one person be capable to pronounce upon the rectitude of the opinions of those who judged rightly, and another on the erroneousness of those which were incorrect, or would the same person be competent to decide respecting them both?
Ion. The same, evidently.
Socrates. What would you call that person?
Ion. A physician.