“Prove it . . .” is a familiar challenge, one, often strengthened to “unless you prove it I can disregard what you claim.” However, ever since Epictetus, c. 100 AD, it has met its match: DISCOURSESCHAPTER XXV How is logic necessary? When someone in [Epictetus’] audience said, Convince me that logic is necessary, he answered: Do you wish me to demonstrate this to you?—Yes.—Well, then, must I use a demonstrative argument?—And when the questioner had agreed to that, Epictetus asked him. How, then, will you know if I impose upon you?—As the man had no answer to give, Epictetus said: Do you see how you yourself admit that all this instruction is necessary, if, without it, you cannot so much Read More ›