Sources of Knowledge
This area studies the basic ways beliefs are produced and warranted — through the senses, through reason, through memory and self-awareness, and through the word of others — asking of each whether and how it can deliver knowledge.
Definition
Sources of knowledge are the basic faculties and channels — perception, reason, memory, introspection, and testimony — through which beliefs are formed and from which they may derive epistemic justification or warrant.
Scope
The area covers the standard catalogue of epistemic sources: perception, a priori reason, memory and introspection, and testimony. For each it asks what kind of justification the source provides, how that justification can fail, and how the source relates to the structure and analysis of knowledge. It treats the rationalism-empiricism dispute over the a priori and the epistemology of testimony as a bridge to social epistemology, while leaving the structure of justification and skeptical challenges to neighbouring areas.
Sub-topics
Core questions
- Which faculties and channels can generate knowledge, and how?
- Is any knowledge independent of experience, or does all knowledge derive from the senses?
- Can memory and introspection extend or merely preserve what we know?
- How can the testimony of others be a genuine source of knowledge?
Key theories
- Empiricism
- All substantive knowledge derives ultimately from sense experience; Hume argues that ideas are copies of impressions and that matters of fact are known only through experience and the relations it suggests.
- Rationalism and the synthetic a priori
- Reason is an independent source of substantive knowledge; Kant argues that there are synthetic a priori judgements, known independently of experience yet genuinely informative, grounding mathematics and the conditions of experience.
History
The early modern dispute between empiricists such as Locke and Hume, who traced all ideas to experience, and rationalists such as Descartes and Leibniz, who admitted innate or purely rational knowledge, framed the study of epistemic sources. Kant's attempt to reconcile them through the synthetic a priori reshaped the debate, and contemporary epistemology has added a sustained treatment of testimony as a fundamental source in its own right.
Debates
- Empiricism versus rationalism about the sources of knowledge
- Empiricists hold that experience is the sole source of substantive knowledge and treat a priori claims as either trivial or empirical in disguise, while rationalists maintain that reason yields informative knowledge independent of experience, a dispute Kant sought to resolve and that persists over the a priori.
Key figures
- David Hume
- Immanuel Kant
- John Locke
- Robert Audi
Related topics
Seminal works
- hume-enquiry
- kant-critique
Frequently asked questions
- What counts as a source of knowledge?
- A source of knowledge is a basic way beliefs are formed that can confer justification, such as perception, reasoning, memory, introspection, and testimony. Epistemologists ask of each whether it is a fundamental source or derivative of others, and under what conditions it yields knowledge.
- Is testimony really a basic source of knowledge?
- Much of what anyone knows comes from others, and many epistemologists treat testimony as a basic source on a par with perception. Others hold it is reducible, justified only when backed by one's own perceptual and inductive evidence, which is a central dispute in the epistemology of testimony.