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That logic is necessary.

When one of the company said to him, "Convince me that logic is necessary," - Would you have me, he said, demonstrate it to you? "Yes." Then I must use a demonstrative form of argument. "Granted." And how will you know, then, whether I argue sophistically? On this, the man being silent, You see, says he, that even by your own confession, logic is necessary; since without it, you cannot even learn whether it be necessary or not. [p. 1220]

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