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LLOS.ai · Thinking Lab

Circular Reasoning

The proof and the claim are the same sentence.

"Why should I trust you?" "Because I'm trustworthy." The argument assumes exactly what it set out to establish, so it can never fail and it never shows you anything new. Going round twice is not the same as getting somewhere.

21of 32 cards
4hints, in order
7thinking lenses
~10minutes

The question

Write your answer before you read anyone else's
Card 21 · Critical Thinking
🔄 🔁 ∞

Can you prove something by just repeating it differently?

💭 How to think about this

"It's true because I believe it, and I believe it because it's true!" "The book is good because it's well-written, and it's well-written because it's good!" These arguments go in circles - they ASSUME what they're trying to PROVE! Let's learn to spot circular reasoning!

Four hints, in order

Each one unlocks the next
🔒 Write a line or two above and the hints unlock.

CIRCULAR REASONING = using your conclusion as your premise! The "proof" and the "claim" are the same thing said different ways. "Why should I trust you?" "Because I'm trustworthy!" - that doesn't actually prove anything new!

A is true because B is true. B is true because A is true. WAIT - nothing was actually proven! The argument just went in a circle! Also called "begging the question" - you ASSUME the answer in your question/premise!

• "This medicine works because it's effective" (effective = works!)

• "He's a great leader because he leads well" (same thing!)

• "God exists because the Bible says so. Bible is true because it's God's word" (circular!)

• "I'm right because I'm never wrong" (assumes the conclusion!)

Ask: "Is the evidence INDEPENDENT of the claim?" If the 'proof' is just the claim rephrased - CIRCULAR! Real proof needs EXTERNAL evidence that doesn't already assume the conclusion. Look for synonyms hiding the circle!

Circular reasoning uses the conclusion as a premise - proving nothing because it assumes what it tries to prove!

The structure:

Claim: A is true

Evidence: Because B is true

But B = A (just rephrased!)

Result: No actual proof!

Why it's tempting:

• Sounds logical at first

• Uses confident language

• Rephrasing hides the circle

• We might not notice the loop

How to break the circle:

Ask: "What INDEPENDENT evidence supports this?"

• Evidence should come from OUTSIDE the claim

• Evidence shouldn't assume the conclusion

• Look for actual data, observations, or facts

Fixed examples:

❌ "This medicine works because it's effective"

✅ "This medicine works because in trials, 80% of patients improved"

❌ "He's a great leader because he leads well"

✅ "He's a great leader because his team achieved all their goals and morale is high"

Remember: If the "proof" is just the claim wearing a different costume, it's circular reasoning!

Which thinking lens did you use?

Select every one that applies

For parents & teachers

What this card is really practising

🌱 Story Seed

"My room is clean because everything is where it should be, and everything is where it should be because my room is clean!" - Maya tried to convince her mom. Mom smiled: "That's circular logic, sweetie. Show me the actual clean room!"

Discussion Guide →
  • Spot circles together: Listen for "because it is" reasoning in ads or arguments
  • Ask for real evidence: "What OUTSIDE proof supports this claim?"
  • Play the synonym game: Is the evidence just the claim in different words?
  • Connect to daily life: "I deserve dessert because I'm good" - good at what?

Keep going

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