You claim to know the earth orbits the sun. Someone asks why. You cite astronomical data. They ask why you trust the data. You cite scientific methodology. They ask why you trust methodology. This exchange is an example of:
AA failure of your knowledge — you should have been able to stop the questioning earlier
BThe regress problem — every justification cites a further belief that itself requires justification
CThe coherence theory of truth — you need your beliefs to cohere rather than be grounded
DSkepticism — the questioner is showing that knowledge is impossible
This is precisely the regress problem in action: every time you justify a belief by citing another belief, that belief becomes the next target of 'why do you believe that?' The chain either continues indefinitely, goes circular, or stops at something claimed to need no further justification. This is not a failure of this particular piece of knowledge (option A) — it is a structural feature of justification itself, and any belief would generate the same regress.
Question 2 Multiple Choice
A coherentist responds to the regress problem by arguing that beliefs are justified by their coherence with the overall system of beliefs. The most serious objection is:
AIt requires an infinite number of beliefs, which finite minds cannot hold
BIt permits internally consistent but globally false belief systems to count as equally justified
CIt relies on circular reasoning in small, local cycles that are obviously invalid
DIt cannot explain why some beliefs feel more certain than others
The most serious objection to coherentism is that two people with radically different but internally consistent worldviews would each count as equally justified. Coherence is an internal standard — it doesn't guarantee any connection to reality. Note that option C misrepresents coherentism: coherentists don't endorse small local circles but justify beliefs through coherence with the entire global system of beliefs.
Question 3 True / False
The regress problem is ultimately a psychological question about whether humans can actually hold an infinite number of beliefs.
TTrue
FFalse
Answer: False
The topic explicitly addresses this misconception. The regress problem is about the *logical structure* of justificatory relations — whether 'justified by' can coherently apply to a belief that depends on an unjustified further belief. The psychological question (can humans hold infinitely many beliefs?) is relevant to evaluating infinitism as a solution, but the problem itself is logical and structural.
Question 4 True / False
The regress problem applies primarily in epistemology — it does not arise in ethics, mathematics, or law.
TTrue
FFalse
Answer: False
The regress problem is structurally analogous across domains. In ethics: what justifies moral principles — and what justifies that justification? In mathematics: axioms are accepted without proof — are they justified, and if so, how? In law: what justifies the constitution's authority? In each domain, justification either bottoms out in something unjustified, goes circular, or regresses infinitely. The problem reveals a structural feature of 'justified by' that appears wherever that concept is applied.
Question 5 Short Answer
Why does the Agrippa trilemma suggest that the concept of justification itself is harder than it initially appears?
Think about your answer, then reveal below.
Model answer: The trilemma shows that there are only three ways the justification chain can terminate — infinite regress, circular reasoning, or stopping at a self-justifying or unjustified belief — and each faces serious objections. Infinite regresses seem psychologically unrealizable; circles seem viciously circular; stopping points seem dogmatically assumed. Since one of these three must hold if any belief is justified, and all three seem problematic, the very coherence of 'justified belief' is called into question.
The trilemma is not solved by pointing to one horn and calling it the answer — each horn is a serious philosophical position (foundationalism, coherentism, infinitism) that has been defended by major philosophers and faces genuine objections. The point of the regress problem is not to show that knowledge is impossible but to reveal that the 'justified' condition in 'justified true belief' is philosophically complex and requires a theory of its own.