Epistemic Justification — In epistemology, justification is the property that transforms a mere true belief into knowledge (or, at least, into an epistemically responsible belief). The classical analysis of knowledge as “justified true belief” (JTB) traces back to Plato (Theaetetus, 201d–210a) and remained canonical until 1963, when Edmund Gettier, in a brief and celebrated article (“Is Justified True Belief Knowledge?”, Analysis, 1963), demonstrated that JTB is insufficient — there are cases in which an agent holds a justified true belief without possessing knowledge (the so-called “Gettier cases”).
The debate about the nature of justification is structured primarily around three classical theories:
Foundationalism: Justification has a hierarchical structure. There are basic or foundational beliefs — beliefs that are justified without depending on other beliefs for their justification. These serve as the foundation for all other beliefs, which are justified through inferential relations from the basic ones. Classical foundationalism (Descartes) locates basic beliefs in certain and indubitable beliefs (the cogito, clear and distinct intuitions). Moderate foundationalism (Roderick Chisholm, Theory of Knowledge, 1st ed. 1966) allows that basic beliefs may be fallible but assigns them a privileged epistemic status through their relation to experience.
Coherentism: Justification has a holistic and circular structure. No belief is basic; all beliefs are justified by their coherence with the total system of beliefs. A belief is more or less justified depending on how well it integrates into the whole. Laurence BonJour (The Structure of Empirical Knowledge, 1985) is the most influential contemporary defender of coherentism, though he later moved toward foundationalism. The classical problem with coherentism is the possibility of coherent systems entirely disconnected from reality — a system of beliefs can be internally coherent and false.
Reliabilism: A belief is justified if and only if it is produced by a reliable belief-forming process — a process that regularly produces true beliefs. Alvin Goldman (“What Is Justified Belief?”, 1979; Epistemology and Cognition, 1986) is the principal proponent. Reliabilism is an externalist theory: what justifies a belief may be external to the subject’s perspective — the subject need not know that their belief-forming process is reliable in order to be justified.
Internalism versus Externalism: This is the deepest axis of the contemporary debate on justification. Internalism holds that the factors that determine the justification of a belief are all internally accessible to the subject — they are mental states, evidence, reasons that the subject can, in principle, recognise as justifying. BonJour and Chisholm are internalists. Externalism holds that factors external to the subject — such as the causal reliability of the belief-forming process — can determine justification, even if the subject has no access to them. Goldman is the paradigmatic externalist. The debate reflects a deep tension between the idea that knowledge requires subjective epistemic responsibility (favoured by internalism) and the idea that what matters is the objective connection to truth (favoured by externalism).
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