Abstract

In this dissertation I advance a Jaspersian account of the formation and possession of irrational attitudes. This account stands in opposition to two competing views – externalism and internalism with respect to rational and irrational attitudes. According to externalism, a subject’s attitudes are irrational when they fail to satisfy standards or criteria independent of the subject, such as laws of logic, methods for evidence acquisition, and rules of decision theory. According to internalism, a subject’s attitudes are irrational when they are not supported by reasons selected by the subject. In this dissertation, I take Donald Davidson’s theory of rational and irrational attitudes to be a case of externalism and John Searle’s theory of rational and irrational attitudes to be a case of internalism. While articulating and identifying the merits of externalism and internalism with respect to rational or irrational attitudes, I argue that each account ends up in difficulties: Davidson’s externalism cannot account for the experience of freedom, an individual’s subjectivity, and is unable to avoid an infinite regress of rules; Searle’s internalism struggles to avoid solipsism and an infinite regress of reasons. Karl Jaspers’ account of rational and irrational attitude formation, I argue, avoids the pitfalls of Davidson’s and Searle’s views while preserving the merits of each. On Jaspers’ account, a subject possesses rational attitudes insofar as that subject holds those attitudes to be always open to revision while, at the same time, using those attitudes to bring unity to all manner of phenomena and other attitudes. Irrationality, by contrast, occurs, on the Jaspersian view, when a subject holds onto attitudes with complete and absolute resolution and interprets all else according to these attitudes. Having defined a Jaspersian account of rational and irrational attitudes, I show how it accounts for the irrationality of delusional beliefs and the irrationality of certain worldviews. On Jaspers’ view, I argue, delusions and worldviews are irrational insofar as they are held with absolute conviction, are unamenable to modification, and are used to understand all available evidence, views, and opinions.