Locke’s Principle of Proportionality

Mark Boespflug 1
  • 1 Philosophy Department, University of Colorado Boulder, 232 UCB Boulder, Boulder, USA
Mark Boespflug
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  • Philosophy Department, University of Colorado Boulder, 232 UCB Boulder, CO 80309, Boulder, USA
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Abstract

Locke’s principle of proportionality – among his most important contributions to philosophy – states that we ought to apportion our assent to a given proposition in accord with the probability of that proposition on an adequate body of evidence. I argue that treatments of Locke’s principle fail to avoid interpreting it as a fundamentally doxastic prescription – a precept concerning how we ought to voluntarily control our assent. These interpretations are problematic on account of their implications concerning the degree of control that agents have over the doxastic process, and on account of how they cohere with numerous texts in the Essay. I suggest that the principle, instead, commends that we engage in certain activities, or practices, that tend to produce true beliefs.

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