Epictetus | Discourses | II-25
Epictetus | Stoic
Chapter XXV
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.