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Three arguments about determinism and free will

7 min readSep 14, 2026

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Spock from Star Trek, a paragon of logic. From moviewebimages.com.

Okay, folks, we haven’t talked about free will for a while! (Last time was back in April.) And I know you just can’t help yourselves from wanting more. Because you have no free will, of course. So let us take a few minutes to consider three of the most famous and consequential ancient arguments about free will and determinism, arguments that are still being debated by philosophers today.

Warning: the following will involve a bit of use of formal logic, which I will try to keep to a minimum. Then again, logic is crucial to a good life. Don’t believe me? Here is what Epictetus said in response to a skeptical student:

“When someone in his 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 as know whether it is necessary or not?” (Discourses, II.25)

QED

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by Massimo Pigliucci, a scientist, philosopher, and Professor at the City College of New York. Exploring and practicing Stoicism & other philosophies of life.

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Philosophy Today is dedicated to current philosophy, logic, and thought.