 Serious philosophical defence of a doxastic venture model of faith thus implies a moderate version of fideism, for which epistemic concern is not overridden and for which, therefore, it is a constraint on faith-commitment that it not accept what is known, or justifiably believed on the evidence, to be false. Rather, faith commits itself only beyond, and not against, the evidence—and it does so out of epistemic concern to grasp truth on matters of vital existential importance. The thought that one may be entitled to commit to an existentially momentous truth-claim in principle undecidable on the evidence when forced to decide either to do so or not is what motivates William James’s ‘justification of faith’ in ‘The Will to Believe’ (James 1896 [1956]). If such faith is to be justified, its cognitive content will (on realist assumptions) have to cohere with our best evidence-based theories about the real world. Faith may extend our scientific grasp of the real, but may not counter it. Whether the desire to grasp more truth about the real than science can supply is a noble aspiration or a dangerous delusion is at the heart of the debate about entitlement to faith on this moderate fideist doxastic venture model.