Definition
Fallibilism is the recognition that all knowledge is conjectural — it may contain errors, and no source (sensory experience, authority, tradition, or reason alone) can guarantee truth. It is the precondition for unlimited knowledge growth.
Why It Matters
Fallibilism is the “emergency brake” on human arrogance. Without it, every disagreement becomes an existential battle between “the truth” and “the lie,” leading to dogmatism, stagnation, and violence. By embracing the possibility of being wrong, we enable the mechanism of error-correction—the only known process by which we can move from less-true to more-true models of the world. It is the foundation of both science and a functioning democracy.
Core Concepts
- All knowledge is conjectural: No matter how well-tested, any theory could in principle be wrong. This is not a defect but a feature — it is what makes knowledge improvable.
- Contrast with justificationism: Justificationism demands that knowledge be justified by some ultimate authority (sense data, logical proof, divine revelation). Since no such authority exists, justificationism either leads to dogmatism or infinite regress.
- Fallibilism ≠ relativism: Fallibilism does not say all explanations are equally good. Some explanations are objectively better — harder to vary, more testable, more explanatory. The absence of certainty does not imply the absence of standards.
- Error-correction as the engine: Because we acknowledge fallibility, we build systems for detecting and correcting errors (science, democracy, rule of law, market price signals). These systems work only if we allow them to falsify existing beliefs.
- Popper’s contribution: Karl Popper established fallibilism as the foundation of the philosophy of science. Knowledge grows by conjecture and refutation, not by accumulation of justified beliefs.
- Precondition for unlimited progress: If we deny fallibilism — if we treat any body of knowledge as certain and beyond criticism — we block the mechanism of improvement. The result is stagnation.