 Not all models of faith, however, identify it as primarily a matter of knowing or believing a proposition or a set of them, even with the addition of some affective or evaluative component. What is most central to theistic faith may seem better expressed as believing in God, rather than as believing that God exists. The Christian Nicene creed begins ‘Credo in unum Deum …’ and it is arguable that in this context ‘belief in’ is neither merely an idiomatic variant on, nor reducible to, ‘belief that’ (Price 1965). It may thus be held that theists’ acceptance of propositional truths as divinely revealed rests on believing in God—and it is this ‘believing in’, or ‘having faith in’, which is, fundamentally, the nature of faith. Noting that, while faith is held to be a virtue, believing as such is not, Wilfred Cantwell Smith argues that ‘faith is not belief’, ‘but something of a quite different order’ (Smith 1979, 128), requiring ‘assent’ ‘in the dynamic and personal sense of rallying to [what one takes to be the truth] with delight and engagement’ (142). Arguably, to put or to maintain faith in God involves a readiness to act, perhaps by relying on God in relevant ways and/or grounded in a practical commitment. Our considerations now shift, then, from propositional-attitude-focussed models of faith to those focussed on action, or what J. L. Schellenberg calls ‘operational’ models (2005, 126).