What should we believe? One plausible view is that we should believe what is true. Another is that we should believe what is rational to believe. I will argue that both these theses can be accounted for once we add an independently motivated contextualism about normative terms. According to contextualism, the content of ‘ought’ depends on two parameters – a goal and a modal base (or set of possible worlds). It follows that there is a sense in which we should believe truths and a sense in which we should believe what is rational to believe.
