The Cambridge companion to Locke's "Essay concerning human understanding"

Abstract

Locke’s systematic empiricism identifies the origin of all human knowledge in sense experience, rejecting the doctrine of innate ideas in favor of a mind originally void of characters. Central to this framework is a taxonomy of mental content categorized into simple and complex ideas, which function as the immediate objects of understanding. Within this schema, physical bodies are analyzed through a corpuscularian lens, distinguishing between primary qualities intrinsic to matter and secondary qualities understood as powers to produce sensations. The associated metaphysics addresses the nature of substance as an obscure substratum and provides an influential account of personal identity grounded in the continuity of consciousness. Regarding language, the work argues that human classification relies on nominal essences constructed by the mind rather than the inaccessible real essences of substances. Knowledge is strictly defined as the perception of the agreement or disagreement between ideas, categorized into intuitive, demonstrative, and sensitive degrees. Where certain knowledge is limited, the faculty of judgment provides probable assent based on the grounds of experience and testimony. This epistemological boundary informs a moral theory that envisions ethics as a potentially demonstrable science and a religious philosophy that necessitates the use of natural reason to evaluate claims of revelation and enthusiasm. These doctrines collectively establish the scope and limits of human cognition, situating the understanding within a state of mediocrity between total ignorance and perfect certainty. – AI-generated abstract.