Capítulo 25
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.