This study is about rationality of decisions and actions, illustrating the continuity of the philosophy of mind with ethics and jurisprudence. It brings Wittgenstein's and Davidson's arguments about interpretation to bear on decision theory, social choice theory and the theory of adjudication. In each of these contexts, the author considers the differences and similarities between interpersonal and intrapersonal relationships, and between the resolution of conflicts between persons and the resolution of conflicts faced by individuals. This theme culminates in an examination of the relationship between the values of personal autonomy and those of democracy.