The book develops a unified approach to the rationality and metaphysics of belief and of confidence. As such it lies at the intersection of epistemology and the philosophy of mind. The primary aim of the work is to develop a graceful unified picture of the rational mind. The secondary aim is to show how formal and informal work on rational belief and confidence have a lot to learn from one another. The book explains everything used in its picture of the rational mind from scratch. It should thus be of use to everyone from advanced undergraduate to advanced researcher.