Locke seems to hold that we have knowledge of the existence of external objects through sensation. Two problems face Locke's account. The first problem concerns the logical form of knowledge of real existence. Locke defines knowledge as the perception of the agreement or disagreement between ideas. However, perceiving agreements between ideas seems to yield knowledge only of analytic truths, not propositions about existence. The second problem concerns the epistemic status of sensitive knowledge: How could the senses yield certain knowledge? This (...) essay argues that the key to solving both problems is Locke's claim that simple ideas are all real, adequate, and true. This explains why, on Locke's view, we have certain knowledge through the senses. It also explains how sensitive knowledge can consist in perceiving an agreement between ideas: perceived agreements among simple ideas of sensation are guaranteed to track relations that obtain among really existing things. (shrink)

This article argues that Locke's views about the nature of knowledge, on the one hand, and about the proper regulation of probable judgment, on the other hand, give rise to a radical form of individual epistemic autonomy. Three theses are defended: First, Locke's conception of the nature of knowledge implies that the knowledge of other individuals has little (to no) influence on whether one knows something. Locke denies that knowledge is the kind of thing that could, even in theory, be (...) transmitted by testimony. Second, Locke's treatment of probability and probable judgment gives a specific role to testimonial evidence, but within such strict limits that the probable judgments of others should play no role in influencing the strength of one's own judgments. Third, in his New Essays Concerning Human Understanding, Leibniz recognizes the radicalness of Locke's position and sees this as reason to reject aspects of Locke's account of knowledge and his treatment of probable judgment. Finally, these views have implications for how Locke conceives of collective inquiry and the division of epistemic labor among inquirers. (shrink)