Philosophy
Infinite Regress Arguments in Epistemic Justification
Quick fact
The ancient Greek skeptic Agrippa (around 200 BCE) listed the infinite regress as one of his 'Five Modes' leading to the suspension of judgment.
Why this is interesting
When you say you know something, you usually need to give a reason. But what reasons back up those reasons? And what backs up those? This endless chain of 'why?' forms the core of a classic philosophical puzzle.
Read the full explanation
Understanding Infinite Regress Arguments in Epistemic Justification
Imagine you believe that the coffee in your cup is hot. Why? Because you can feel the warmth. Why trust your senses? Because they've been reliable before. Why trust that reliability? ... Each reason can be challenged, leading to a new reason. This is the infinite regress. It's like looking into two mirrors facing each other: the reflection goes on forever. Philosophers ask: if every justification requires another justification, can we ever have a solid foundation for knowledge? If we can't, does that mean knowledge is impossible? The regress is not just a pedantic point; it challenges the very possibility of having good reasons for our beliefs.
A deeper explanation
The infinite regress argument works by showing that for a belief to be justified, there must be a sufficient reason. That reason, to be sufficient, must itself be justified (otherwise it's arbitrary). This generates a chain: B1 justified by B2, B2 by B3, and so on. Since finite humans can't complete an infinite chain, we face a dilemma: either accept an infinite regress (which seems impossible to complete), or find a way to stop the regress. This forces us to choose among three structural options: (1) Foundationalism: some beliefs are self-justifying or basic (like axioms), stopping the regress. (2) Coherentism: beliefs support each other in a circle, like a web, so no single belief needs a linear foundation. (3) Infinitism: an infinite chain is acceptable; what matters is the availability of reasons, not completing them. The argument matters because it reveals that the structure of justification is a core problem in epistemology: any theory of knowledge must say how justification chains terminate, loop, or spiral indefinitely.