When your argument assumes what it’s trying to prove
“The Bible is true because it says so in the Bible.”
That sentence is the clearest possible example of begging the question. Once somebody sees it, they start seeing this structure everywhere, and it turns out a surprising amount of everyday argument is built on exactly this move.
Begging the question is circular reasoning.
The person assumes the truth of what they’re trying to prove as part of their proof. The conclusion is smuggled into the premise. The argument goes around in a circle and never gets anywhere. It feels like a reason has been given. No reason has been given. The sentence just said the same thing twice in different words.
Here’s a more subtle version.
“We need to ban this book because it’s dangerous, and we know it’s dangerous because it’s the kind of book that should be banned.”
Read that carefully. The second half doesn’t give you any new information. It just restates the first half in different words. What makes it dangerous? Somebody said it should be banned. Why should it be banned? Because it’s dangerous. There’s no independent evidence in the sentence. No reasoning that doesn’t assume its own conclusion.
Politicians do this constantly.
“This candidate has the best economic plan because they understand the economy better than anyone else, and we know they understand the economy better because their economic plan is the best.” Sounds like you’ve been given two separate pieces of information. You haven’t. It’s one claim said twice with extra words in the middle.
Begging the question is tricky to catch.
The arguments often sound like they’re going somewhere. They use logical-sounding connective words – “because,” “therefore,” “since” – that create the impression of reasoning. But if you trace back to where the argument actually gets its support, you find the premise needed the conclusion to be true in the first place. The structure looks like a bridge. It’s a loop.
The test is pretty clean.
Remove the conclusion from the argument and see if the premise still gives you any reason to believe the conclusion. In circular reasoning, once you remove the conclusion, the entire support collapses. Because the premise was just the conclusion dressed differently.
“We should trust experts because experts know what they’re talking about.”
What does “knowing what they’re talking about” mean? Being an expert. The sentence said nothing. It feels authoritative because it uses the word “because,” but the word “because” can’t do the work of an actual reason.
Religious and political debates are full of this.
“Traditional values are right because they’ve stood the test of time.” What does standing the test of time prove? That they’re traditional. The sentence said the same thing twice. “This policy is common sense because it’s what everyone already knows.” Being commonly known isn’t evidence. That’s just saying the belief is popular, which is a different fallacy (bandwagon, coming up in 15.12).
When you spot circular reasoning, the useful move is to ask what independent evidence supports the claim.
Not a restatement. Not a synonym. Something that wouldn’t already have to be true for the conclusion to be true. If nothing comes back, you’ve got a closed loop.
And watch yourself.
It’s easy to build circular arguments around positions you hold strongly. When you’re deeply convinced something is true, you stop noticing you’re not actually arguing for it. You’re describing it in progressively more emphatic ways and trusting the emphasis to count as reasoning. It doesn’t.
Every argument needs an anchor outside itself.
Otherwise it’s just repeating.