Of the Conduct of the Understanding

The central claim is that the understanding is liable to natural defects—confusion in ideas, precipitancy in judgment, partiality, and the empire of habit—but that these defects admit of remedy through disciplined self-examination. Locke rejects the view that intellectual error is simply a matter of insufficient information or innate incapacity. The mind errs through its own faulty conduct: it embraces opinions too hastily, fails to examine the grounds of belief, and submits to custom rather than reason. The Conduct is therefore a practical manual, not a theoretical treatise: its aim is to teach readers how to govern their own understanding, to suspend judgment where evidence is lacking, and to cultivate the freedom of thought that Locke regards as a duty every rational creature owes to itself.

Locke began writing the Conduct in April 1697 as a projected chapter for the fourth edition of the Essay, but the topic expanded beyond his expectations. He wrote to Molyneux that it would 'make the largest chapter of my Essay' . He never completed it to his satisfaction. In a letter written days before his death in October 1704, Locke confessed that he had only set down remedies 'as any miscariage [of the understanding] has accidentaly come into my minde,' and that if published, 'the heads and chapters must be reduced into order' . That order was never imposed. The text we have is long, repetitive, and structurally loose, reflecting its status as a work-in-progress rather than a finished treatise .

The Conduct extends the Essay's epistemological project into the domain of intellectual practice. Paul Schuurman argues that the Conduct should be understood within the context of Locke's 'way of ideas': its analysis of error presupposes the two-stage structure of the Essay, in which individual ideas must first be clear and distinct, and reasonings must then be built from combinations of those ideas . The Conduct applies this framework normatively, showing how faults at either stage—confused ideas or faulty reasoning—produce error, and how disciplined examination can correct them. It was conceived as a chapter of the Essay, and its concerns are continuous with the larger work's empiricist account of how the mind acquires and organizes knowledge.

The Conduct has been remarkably durable for an unfinished fragment. Schuurman records 163 English editions and 21 translations into French, German, Italian, and Russian . This popularity suggests that it was received less as a systematic philosophical treatise than as a practical guide: Tom Stoneham and Elisabeth Thorson describe it as having been received 'as a sort of self-help manual for those interested in improving their critical reasoning' . From the nineteenth century onward, it was frequently printed alongside Some Thoughts Concerning Education and treated as one of Locke's educational writings. Modern editions, including those by F. W. Garforth and R. W. Grant and N. Tarcov, have reinforced this association by presenting the Conduct and the Education as Locke's two major contributions to pedagogy .

A frequent misreading treats the Conduct as straightforwardly a work of educational theory, a companion to Some Thoughts Concerning Education. Schuurman challenges this: while the Conduct's analysis of error yields numerous educational reflections, its primary context is epistemological, not pedagogical . The work is addressed to adults who wish to govern their own understanding, not to parents or tutors managing children. Its remedies—suspending judgment, examining evidence, resisting habit—are exercises of intellectual self-discipline rather than techniques of instruction. The nineteenth-century practice of printing the Conduct with the Education created an association that has obscured the work's original character as a projected chapter of the Essay, concerned with the normative conduct of the mind rather than with pedagogy as such.