 On the doxastic venture model, faith involves full practical commitment to a faith-proposition’s truth, despite the recognition that this is not ‘objectively’ justified on the evidence. Kierkegaard’s definition of faith as ‘an objective uncertainty held fast in an appropriation process of the most passionate inwardness’ in Concluding Unscientific Postscript (Kierkegaard 1846 [1968, 180]) is an example of a doxastic venture model. So too is Paul Tillich’s account of faith as ‘the state of being ultimately concerned’, since the claim of the object of one’s ultimate concern to ‘promise total fulfilment even if all other claims have to be subjected to it or rejected in its name’ cannot in principle be established on the basis of the evidence (Tillich 1957 [2001, 1 and 21]).