This paper offers a theory of how epistemic and practical reasons for belief can be combined into all-things-considered reason. Unlike alternative theories, it does not involve any sharp cut-offs or lexical priorities among types of reason. The theory allows that the relative strengths of the practical and epistemic reasons matter, as does the distance between the epistemically rational credence and the practically rational credence. Although there are important differences between the structure of epistemic and practical reason, they can still be combined in a satisfactory way. The central idea is that epistemic reason determines an epistemically rational doxastic state, and practical reason can push it around.
Platonic arguments often have premises of a particular form which is misunderstood. These sentences look like universal generalizations, but in fact involve an implicit qua phrase which makes them a fundamentally different kind of predication. Such general implicit redoubled qua predications (girqps) are not an expression of Plato's proprietary views; they are also very common in everyday discourse. Seeing how they work in Plato can help us to understand them.
In this article, I show that (i) from what I call a “Kripkean” account of the relations between conceivability and metaphysical necessities, (ii) an apparently plausible principle relating conceivability and epistemic modality, and (iii) the duality of epistemic modalities, one can show the utterly anti-Kripkean result that every metaphysical necessity is an epistemic necessity. My aim is to present and diagnose the problem and evaluate the costs of some possible Kripkean reactions. In particular, I will evaluate the consequences and theoretical costs of rejecting the main ingredients of the argument, namely that we cannot genuinely conceive the negations of metaphysical necessities, that there is no postulated relation between conceivability and epistemic possibility (actually, between unconceivability and epistemic impossibility), and that epistemic possibility and necessity are not dualities.
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