In the Essay Concerning Human Understanding, Locke maintains that ?Reason must be our last Judge and Guide in every Thing,? including matters of religious faith, and this commitment to the primacy of reason is not abandoned in his later religious writings. This essay argues that with regard to the relation between reason and religious faith, Locke is primarily concerned not with evidence, but with consistency, meaning, and how human beings ought to respond to their inclinations, including their inclinations to believe. (...) Leibniz, on the other hand, stakes out an alternative conception of the relationship between faith and reason that assigns to faith the role of a primary truth. For Leibniz, some religious propositions can be believed immediately and without an additional examination and evaluation by reason. The essay maintains that the differences between the two regarding faith and reason are tied to a broader disagreement about how much of the human understanding is due, in Locke's words, to ?Labour, Attention and Industry? (shrink)

A striking feature of Newton’s thought is the very broad reach of his empiricism, potentially extending even to immaterial substances, including God, minds, and should one exist, a non-perceiving immaterial medium. Yet Newton is also drawn to certain metaphysical principles—most notably the principle that matter cannot act where it is not—and this second, rationalist feature of his thought is most pronounced in his struggle to discover ‘gravity’s cause’. The causal problem remains vexing, for he neither invokes primary causation, nor accepts (...) action at a distance by locating active powers in matter. To the extent that he is drawn to metaphysical principles, then, the causal problem is that of discovering some non-perceiving immaterial medium. Yet Newton’s thought has a third striking feature, one with roots in the other two: he allows that substances of different kinds might simultaneously occupy the very same region of space. I elicit the implications of these three features. For Newton to insist upon all three would transform the causal question about gravity into an insoluble problem about apportioning active powers. More seriously, it would undermine his means of individuating substances, provoking what I call ‘Newton’s Substance Counting Problem’. (shrink)