Book 2
25
WHEN one of those who were present said, Persuade me that logic is necessary, he replied, Do you wish me to prove this to you? The answer was—Yes.—Then I must use a demonstrative form of speech.—This was granted.— How then will you know if I am cheating you by my argument? The man was silent. Do you see, said Epictetus, that you yourself are admitting that logic is necessary, if without it you cannot know so much as this, whether logic is necessary or not necessary?
What is the property of error.
26
EVERY error comprehends contradiction: for since he who errs does not wish to err, but to be right, it is plain that he does not do what he wishes. For what does the thief wish to do? That which is for his own interest.Compare Xenophon, Mem. iii. 9. 4. If then the theft is not for his interest, he does not do that which he wishes. But every rational soul is by nature offended at contradiction, and so long as it does not understand this contradiction, it is not hindered from doing contradictory things: but when it does understand the contradiction, it must of necessity avoid the contradiction and avoid it as much as a man must dissent from the false when he sees that a thing is false; but so long as this falsehood does not appear to him, he assents to it as to truth.
