Philosophy & Critical Thinking: Thesis defence

What you'll be able to do: Hold a philosophical thesis under sustained, real questioning long enough to find out whether it's actually yours, or just something you'd read and agreed with.

The dialogue that invented this method

The Euthyphro is the method's founding demonstration, and it's worth reading as exactly that rather than as a text you're summarising. Socrates asks Euthyphro to define piety. Each attempt collapses within a few follow-ups:

"The pious is what I'm doing now, prosecuting my father." Socrates: that's an example, not a definition. Give me the form that makes all pious things pious.

"The pious is what is loved by the gods." Socrates: the myths have the gods disagreeing among themselves, so the same act could be loved by one god and hated by another. Refined: "what is loved by all the gods."

That refinement produces the Euthyphro dilemma proper: is an act pious because the gods love it, or do the gods love it because it's pious? Take the first horn and piety is arbitrary, whatever the gods happen to favour. Take the second and there's a standard of piety independent of the gods, and the definition hasn't told you what that standard actually is.

The dialogue ends in aporia, no surviving definition, and Euthyphro leaves with his confidence completely unchanged. That's the object lesson the whole method is built on: confidence and defensibility are different things, and sustained questioning is what exposes the gap between them.

A modern case: biting the bullet or not

A student defending act utilitarianism gets pressed on Rawls's separateness- of-persons objection (A Theory of Justice, 1971): if publicly punishing one innocent person, and successfully hiding the deception, would maximise aggregate welfare, utilitarianism seems to say do it.

The common first move is: "but that would never actually maximise welfare, because of reputation effects and rule-breaking down the line." That's a retreat to rule utilitarianism, made without noticing it was a retreat. Sustained questioning closes the escape: stipulate a case where it really would maximise welfare, and no one would ever find out. Now what do you say? That forces an honest answer, either bite the bullet (J. J. C. Smart's route) or actually move to a different theory and say so. Only real pressure, held for more than one exchange, surfaces which one you're doing.

How to run it

1. State your thesis as one sentence, not a paragraph of hedges.
2. Ask for sustained questioning , real follow-ups on what you actually said, not a fresh list of prepared objections each time.
3. When you retreat to a modified position, name the retreat out loud. "I'm now defending rule utilitarianism, not act utilitarianism", rather than letting the shift happen silently.
4. Stop when you hit a stable position or genuine aporia, and be honest about which one it was.
5. Ten minutes minimum before "well, I just think that" counts as an answer.

I'm going to state a thesis, and I want you to question me on it like a sceptical examiner: real follow-ups on what I actually say, not a fresh list of prepared objections. Push until I either give a stable answer or admit I don't have one. Don't let me retreat to a different, easier position without pointing out that I've moved.

The tell

Your answer to every follow-up is a restatement of your original claim in different words. If ten minutes of pressing produces no new information, just the same sentence rephrased, you're defending a slogan, not a thesis.

Try this today

Take the thesis you're most confident about in your current essay, and give it exactly this treatment before you write the essay, not after you've already committed the confident version to the page.