The Varieties of Religious Experience: A Study in Human Nature is a book by the Harvard psychologist and philosopher William James that comprises his edited Gifford Lectures on "Natural Theology" delivered at the University of Edinburgh in Scotland between 1901 and 1902. These lectures concerned the nature of religion and the neglect of science, in James' view, in the academic study of religion. Soon after its publication, the book found its way into the canon of psychology and philosophy, and has remained in print for over a century.

'Pragmatism' contains a series of public lectures held by William James in Boston 1906–7. James provides a popularizing outline of his view of philosophical pragmatism while making highly rhetorical and entertaining lashes towards rationalism and other competing schools of thought. James is especially concerned with the pragmatic view of truth. True beliefs should be defined as, according to James, beliefs that can successfully assist people in their everday life. This is claimed to not be relativism...