Circular reasoning, often referred to as circular logic, represents a significant pragmatic defect in an argument. It is a type of logical fallacy where the person making the argument starts with the very conclusion they are trying to prove. This makes the argument unconvincing to anyone who doesn't already believe the conclusion, as the premises offered for support are just as much in need of proof or evidence as the conclusion itself. Essentially,
it creates a situation where the argument becomes a matter of faith rather than a logical deduction.
This fallacy is closely related to "begging the question," and in modern usage, these two terms are often used interchangeably to describe the same logical flaw. The core issue is that the argument provides no independent ground or evidence for its conclusion, leaving the listener without a valid reason to accept the premises unless they have already accepted the conclusion.
The Structure of Circularity
Circular reasoning frequently takes a specific form: "A is true because B is true; B is true because A is true." This structure highlights the interdependent nature of the propositions, where each relies on the other for its validity, creating a closed loop. A simple example illustrating this is the statement: "This statement is correct because it says it is correct." Here, the correctness of the statement is asserted based solely on the statement's own claim, offering no external verification or logical support.
Detecting circularity can be straightforward in short, direct arguments like the example above. However, the challenge increases significantly when the circularity involves a longer chain of propositions. In such cases, the interconnectedness of the premises and conclusion might be obscured by the complexity or length of the argument, making the fallacy harder to identify immediately. The argument might weave through several points, eventually returning to its starting premise without introducing any new, independently verifiable information.
Why Circular Reasoning Fails to Persuade
The primary reason circular reasoning is considered a defect is its inability to persuade. An argument's purpose is typically to convince an audience of the truth of a conclusion by presenting supporting evidence or reasons. When those reasons are themselves dependent on the conclusion, the argument fails to provide any new information or logical progression that would lead a skeptical listener to accept the conclusion. It essentially asks the listener to accept the conclusion before any real evidence has been presented.
This lack of independent support means that the argument cannot stand on its own merits. It requires a pre-existing belief in the conclusion for its premises to be considered valid. For instance, if someone argues that a certain medicine works because it is effective, they are simply restating the conclusion in different words. To someone who doubts the medicine's efficacy, this argument offers no new information to change their mind. They would still be left wondering *why* it is effective, and the circular argument provides no answer. This makes circular reasoning a pragmatic flaw, as it undermines the very goal of argumentation: to establish truth through reasoned discourse.
