Lesson · 4 min Gentle
Going in Circles
In one line If a reason only works on people who already believe the conclusion, it is doing no work.
Circular reasoning uses the conclusion as one of its own reasons: “The book is reliable because it says it is reliable.” Every step fits, which is why it can sound tight. A listener who doubted the conclusion had no reason to grant the premise either.
To spot one, ask: if I did not already believe the conclusion, would this reason move me? A reason that only works on people who are already convinced does no work. Sometimes the circle is wide: A is backed by B, B by C, and C quietly by A.
Not every repeated idea is circular; a definition or a summary can restate a point fairly. The fault is an argument meant to persuade that assumes what it claims to show. The repair is an outside reason: a fact, a witness, a test.
The trusted fortune-teller
A fortune-teller says her cards predict the future. Asked for proof, she says, “My cards are right, and you can trust my cards because they belong to someone whose predictions come true.”
Nothing outside the cards appears in the chain. A listener asks, “What would show a prediction failed?” and the fortune-teller has no answer. A written record of predictions and outcomes would be the outside reason the circle lacks.
Try this today Pick an argument you like and ask whether its reason would move someone who doubts the conclusion.
Cite or share this lesson
A plain reference you can paste into notes or an essay:
Quest2Reason. “Going in Circles.” https://quest2reason.com/learn/lesson/going-in-circles. Accessed 13 November 2026.
Sources
- Stanford Encyclopedia of Philosophy, “Fallacies” — An account of begging the question and circular arguments among the common fallacies.
- Stanford Encyclopedia of Philosophy, “Informal Logic” — On how arguments are assessed in ordinary language, including arguments whose premises assume their conclusion.
- Wikipedia, “Circular reasoning” — Using the conclusion as a premise.