Mind, Matter, and Meaning

John Locke

John Locke (1632–1704) was an English philosopher whose work in epistemology, politics, education, and religion influenced later empiricism and liberal political thought. An Essay Concerning Human Understanding investigates the origins, limits, and degrees of human knowledge. Its accounts of ideas, perception, and personal identity remain central to debates about how a mind relates to the world.

Major Works

  • An Essay Concerning Human Understanding (1689) examines ideas, knowledge, language, and judgment; its chapter on personal identity was added in the second edition of 1694.
  • Two Treatises of Government (1689) develops an account of political authority, rights, and legitimate resistance.
  • A Letter Concerning Toleration (1689) argues for religious toleration within limits that also remain subjects of criticism.
  • Some Thoughts Concerning Education (1693) addresses education and character formation.

Sensation, Reflection, and the Way of Ideas

Locke rejects innate ideas and principles as an explanation of the contents of thought. Ideas arise through sensation, concerning external things, and reflection, concerning the mind’s own operations, such as thinking, willing, and doubting. Simple ideas are received; the understanding can combine, compare, and abstract from them to form more complex ideas. This makes the mind more than a passive receptacle even within his empiricist account.

His definition of an idea as whatever is the object of the understanding when a person thinks leaves interpretive questions. A traditional representative reading makes ideas the immediate objects of awareness, through which external objects are known. On a strong “veil of perception” reading, the perceiver inspects inner items while the external world remains behind them.

Other interpreters resist this picture, treating ideas in terms of acts or contents of perception rather than a separate inner object. Scholars also distinguish accepting representation from accepting the veil’s skeptical consequences. Locke’s criticism of Malebranche and his confidence in sensitive knowledge of external things complicate attributing the strongest veil account to him. The dispute concerns what an idea is and what follows from its role, not whether Locke used the vocabulary of ideas.

Primary and Secondary Qualities

In Essay II.8, primary qualities include solidity, extension, figure, motion or rest, and number. Locke regards these as qualities belonging to bodies, and he says our ideas resemble them. Secondary qualities, such as color, sound, and taste, are powers of bodies to produce ideas in perceivers through their primary-quality constitution.

A rose’s color, on this account, depends on the body’s power to affect an appropriate perceiver. The idea of redness does not resemble the particle structure responsible for that effect. Secondary qualities are therefore not simply nonexistent: bodies have the relevant powers. The account distinguishes those powers from the sensory ideas they produce.

Critics question the resemblance claim, the classification of particular qualities, and the grounds for knowledge of unobserved particles. Some also question whether primary qualities are less dependent on perceptual conditions than secondary ones. Locke’s corpuscular explanation supplies a scientific framework for the distinction, while his repeated acknowledgments of limited knowledge constrain how much that framework can establish.

Memory, Knowledge, and Mental Imagery

Locke compares the understanding with a dark room receiving pictures and memory with a storehouse. These metaphors have encouraged later inner-picture readings. They do not by themselves decide whether he believed in a literal internal spectator or collection of preserved mental objects.

His account of memory in Essay II.10 explicitly distinguishes retaining an idea from having it continuously present. Remembering involves reviving a perception with awareness of having had it before. Describing memory as a storehouse must therefore be read alongside his account of what retention actually involves, not treated as a complete mechanical theory.

Locke defines knowledge through perception of agreement or disagreement among ideas and distinguishes intuitive, demonstrative, and sensitive knowledge. Sensitive knowledge of presently existing external things has a different degree and basis of certainty from intuition and demonstration, but Locke does not simply dismiss it as opinion. Much ordinary judgment proceeds on probability rather than knowledge in this strict sense.

Persons, Consciousness, and Identity

The chapter “Of Identity and Diversity” distinguishes the persistence of masses of matter, living organisms, human beings, and persons. A living body can remain the same organism while its material parts change. Personal identity requires a different inquiry.

A person is a thinking, intelligent being capable of reason, reflection, and considering itself as the same across times and places. Locke locates personal identity in sameness of consciousness, rather than in the sameness of a particular body or soul. In the prince-and-cobbler example, the prince’s consciousness accompanies his soul into the cobbler’s body. Locke’s verdict distinguishes the same person from the same human being.

Memory extends consciousness backward, but interpreting consciousness as nothing more than direct episodic memory is contested. Some readings emphasize a continuing conscious life; others emphasize appropriation of past actions as one’s own. Locke also calls “person” a forensic term, connecting selfhood with accountability, reward, and punishment. These concerns belong to the theory rather than being merely later applications of it.

Objections and Interpretive Responses

Circularity. Joseph Butler argues that consciousness of identity presupposes identity and therefore cannot constitute it. Later responses distinguish a criterion of identity from evidence for it, or seek a psychological relation describable without already assuming one person. Whether these reconstruct Locke or state his original account remains disputed.

Transitivity and forgetting. Thomas Reid’s brave-officer case imagines an officer remembering a childhood punishment and an old general remembering his life as the officer but not the childhood event. A direct-memory criterion threatens the transitivity of identity. Later psychological-continuity theories use overlapping chains rather than requiring direct memory of every earlier event. Interpreters of Locke also ask whether the strict memory reading is adequate in the first place.

The veil problem. If only inner ideas are known directly, critics ask how resemblance to an external original can be checked. Representative readings must explain how causal relations support external knowledge without comparing two independently inspected items. Alternative readings deny that Locke’s theory has the obstructing inner object assumed by the criticism.

Locke’s historical importance does not settle these disputes. His empiricism, limited account of substance, and distinction between persons and organisms continue to motivate different philosophical reconstructions.

  • Indirect Realism and Sense-Data — representative readings and their alternatives.
  • The Inner Theater — later interpretations of mental-picture metaphors.
  • Direct Realism — disputes about immediate perceptual access.
  • The Self — consciousness and the persistence of persons.
  • Descartes — rationalist and substance-centered accounts.
  • Hume — later empiricism and criticism of substantial selfhood.
  • McDowell — a later debate about experience and knowledge.

Further Reading

  • Locke, John. An Essay Concerning Human Understanding (first published 1689), especially II.8, II.10, II.27, and Book IV. Use an edition containing II.27, “Of Identity and Diversity,” added in the second edition of 1694.
  • Locke, John. Two Treatises of Government (1689).
  • “John Locke.” Stanford Encyclopedia of Philosophy.
  • “Locke on Personal Identity.” Stanford Encyclopedia of Philosophy.

Mind, Matter, and Meaning presents the site author’s arguments about mind and meaning. It is a separate argumentative work, not a neutral source for the account above.