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II. But medicine has long had all its means to hand, and has discovered both a principle and a method, through which the discoveries made during a long period are many and excellent, while full discovery will be made, if the inquirer be competent, conduct his researches with knowledge of the discoveries already made, and make them his starting-point. But anyone who, casting aside and rejecting all these means, attempts to conduct research in any other way or after another fashion, and asserts that he has found out anything, is and has been the victim of deception.1 His assertion is impossible ; the causes of its impossibility I will endeavour to expound by a statement and exposition of what the art is.2 In this way it will be manifest that by any other means discoveries are impossible. But it is particularly necessary, in my opinion, for one who discusses this art to discuss things familiar to ordinary folk. For the subject of inquiry and discussion is simply and solely the sufferings of these same

[p. 17] ordinary folk when they are sick or in pain. Now to learn by themselves how their own sufferings come about and cease, and the reasons why they get worse or better, is not an easy task for ordinary folk ; but when these things have been discovered and are set forth by another, it is simple. For merely an effort of memory is required of each man when he listens to a statement of his experiences. But if you miss being understood by laymen, and fail to put your hearers in this condition, you will miss reality. Therefore for this reason also medicine has no need of any postulate.

1 Or, with the reading suggested, "both deceives and is deceived."

2 Or, reading ὅτι ἔς1τιν, "that the art really is an art, really exists."

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