Sosa Quote on Virtue Epistemology: Apt Belief

Quote

"A belief is apt if it is true because adroit, because produced by a competent faculty."

— Ernest Sosa, A Virtue Epistemology (2007, Volume 1)

Context

This definition appears in A Virtue Epistemology: Apt Belief and Reflective Knowledge (2007), Volume 1 of Sosa's magnum opus, in which he develops the framework that has defined contemporary virtue epistemology. Sosa had been laying the groundwork since the 1980s, but the 2007 book gave the theory its fullest systematic expression.

Sosa was responding to a long-standing problem in epistemology: the instability of the traditional analysis of knowledge as justified true belief, exposed by Edmund Gettier's 1963 counterexamples. After Gettier, epistemologists searched for a fourth condition that would close the gap — reliability, safety, sensitivity, no-defeater conditions — but each proposal faced new counterexamples. Sosa's innovation was to shift the focus from the justification of individual beliefs to the competence of the faculties that produce them, modeling epistemic assessment on the assessment of skilled performance.

The framework draws an analogy between belief and action. Just as a skilled archer's shot can be evaluated along multiple dimensions — accuracy (did it hit the target?), adroitness (was it skillfully executed?), and aptness (did it hit because skillfully executed?) — a belief can be evaluated for truth, justification (competence), and aptness (truth because of competence). Aptness, the "because" relation, is Sosa's candidate for the core epistemic good.

Meaning

Sosa's definition turns on a causal-explanatory relation: a belief is apt when its truth is explained by the competence of the faculty that produced it. The belief must be true, it must be produced adroitly (by a competent faculty), and the truth must obtain because of that competence — not by luck.

Consider the archer analogy. An archer might hit the target by luck — a gust of wind correcting a poorly aimed shot. That shot is accurate (true) but not apt, because the success is not attributable to skill. Alternatively, the archer might shoot skillfully but miss because of an unexpected gust — the shot is adroit but not accurate. Only when the archer hits the target because the shot was skillfully executed is the performance apt. Sosa applies the same structure to belief: a belief is apt when it is true because produced by a competent cognitive faculty, so that the truth is creditable to the subject's epistemic skill.

This "because" clause is what distinguishes aptness from mere reliability. A thermos might reliably keep coffee hot, but we would not credit the thermos with knowledge — it is not a competent agent. More subtly, a belief might be produced by a generally reliable process yet be true in this instance by luck, as in Gettier cases. Sosa's aptness condition is designed to rule out such cases: if the truth of the belief is not explained by the competence of the faculty, the belief is not apt, however reliable the faculty may be in general.

The framework also distinguishes animal knowledge from reflective knowledge. Animal knowledge is apt belief — belief that is true because competent, available even to non-reflective creatures. Reflective knowledge adds a second-order perspective: the subject must be able to view their first-order belief from above, endorsing it as apt through a higher-order apt belief about its aptness. This two-tier structure allows Sosa to capture the idea that mature human knowledge involves not just reliable belief-formation but an appreciation of why one's beliefs are reliable.

Philosophical Significance

Sosa's virtue epistemology has restructured contemporary epistemology:

Beyond the Gettier problem: By making aptness — truth because of competence — the core of knowledge, Sosa offers a resolution to the Gettier problem that has dominated epistemology since 1963. Gettier cases fail the aptness test because the true belief is not true because of competence but because of luck. This performance-based approach has proven more resilient to counterexample than the condition-addition strategies it replaced.

Internalism and externalism: Sosa's framework bridges the traditional divide between internalist and externalist theories of justification. Competence is an external, world-involving property (it depends on the reliable functioning of faculties in appropriate environments), but reflective knowledge requires an internal, first-personal perspective from which the subject endorses their belief. This "virtue perspectivism" offers a rapprochement between the two traditions that had seemed irreconcilable.

Performance epistemology: The analogy to skilled performance has opened a new way of thinking about epistemic assessment. Beliefs are evaluated not just for truth but for the quality of the cognitive performance that produced them, along the dimensions of accuracy, adroitness, and aptness. This performance-theoretic framework has influenced work on epistemic normativity, epistemic value, and the connection between epistemology and the philosophy of action.

Virtue epistemology as a research program: Sosa's work, alongside that of Linda Zagzebski and others, established virtue epistemology as a major research program. The field now encompasses virtue reliabilism (Sosa, Goldman), virtue responsibilism (Zagzebski, Code), and investigations of specific intellectual virtues — open-mindedness, intellectual courage, humility — as contributors to knowledge. The shift from evaluating beliefs to evaluating agents and their faculties has become a central movement in contemporary epistemology.

Sources

1. Sosa, Ernest. A Virtue Epistemology: Apt Belief and Reflective Knowledge, Volume 1 (Oxford University Press, 2007). Context in: https://plato.stanford.edu/entries/epistemology-virtue/
2. "Virtue Epistemology," Stanford Encyclopedia of Philosophy. Available at: https://plato.stanford.edu/entries/epistemology-virtue/
3. "Virtue Epistemology," Internet Encyclopedia of Philosophy. Available at: https://iep.utm.edu/virtue-epistemology/
4. "Ernest Sosa's Virtue Epistemology," Stanford Encyclopedia of Philosophy. Available at: https://plato.stanford.edu/entries/epistemology-virtue/
5. Greco, John. Achieving Knowledge: A Virtue-Theoretic Account of Epistemic Normativity (Cambridge University Press, 2010).