This article discusses Elizabeth Anscombe's faith and her concept of faith, and the bearing of this on what it is for belief to be reasonable. Reasonableness requires that we make a rough distinction between what can and cannot be taken seriously. At the margin we will rightly be influenced by thinkers such as Anscombe who were well able to appreciate the philosophical consensus but were also prepared to disturb it. She disturbed it in a particular way: by asserting Christian teachings (...) robustly inimical to peace of mind. However she rejected many traditional defences of these teachings as presupposing a faulty understanding of rationality. The article attempts to assess what a more adequate understanding might be. (shrink)