Should we believe our controversial philosophical views? Recently, several authors have argued from broadly conciliationist premises that we should not. If they are right, we philosophers face a dilemma: If we believe our views, we are irrational. If we do not, we are not sincere in holding them. This paper offers a way out, proposing an attitude we can rationally take toward our views that can support sincerity of the appropriate sort. We should arrive at our views via a certain sort of 'insulated' reasoning-that is, reasoning that involves setting aside certain higher-order worries, such as those provided by disagreement-when we investigate philosophical questions. Here is what seems to be a fact about our discipline: Some of us really believe the controversial philosophical views we advocate. 1 Some of us really believe that it can sometimes be rational to have inconsistent beliefs, that seemingly vague predicates must have precise application conditions, or that a person would survive if each of her brain cells were replaced with an artificial functional duplicate. Here is another fact about our discipline: There is widespread disagreement among philosophers surrounding these issues. 2 Given certain assumptions about the nature of these philosophical disagreements, and given certain assumptions about the epistemic import of disagreement more generally, one might come to doubt that our controversial philosophical beliefs are rational-insofar as we have them. Indeed, numerous authors have developed arguments along these lines. 3 The details of their arguments need not concern us, but it will be useful to examine briefly one argument in outline, which will serve as a representative simplification of what they have said: Conciliationism: A person is rationally required to withhold belief in the face of disagreement-given that certain conditions are met. 4 Applicability: Many disagreements in philosophy meet these conditions. No Rational Belief: Philosophers aren't rational to believe many of their controversial views. in any way diminished? As we will see, there is some cause for concern. 7