Abstract

SummaryThe paper examines the conditions someone's believing must satisfy in order to be reasonable and argues that an important necessary condition concerns the nature of the origin and sustain‐ment of the belief. This requirement cannot be captured by conditions on logical relations among the believed propositions, but instead concerns the psychological process of reasoning, concluding, or basing one belief on another. The implications of this result for traditional epistemology are examined, and it is concluded that the most important issues are not just those involved in determining the nature of confirmation but include psychological investigation of the process of belief acquisition