This chapter examines the rationality of mathematical practice in relation to narrative. It begins with a discussion of Alasdair MacIntyre's account of rational enquiry, Three Rival Versions of Moral Enquiry, and how this might translate to scientific and mathematical enquiry. It then considers the telos of mathematical enquiry, along with rival claims to truth as the aim of mathematics. The chapter argues that to be fully rational, mathematicians must embrace narrative as a basic tool for understanding the nature of their discipline and research. It also calls for the partial validity of a pre-Enlightenment epistemology of mathematics as a craft whose advance is made possible only through a certain discipleship.