The Pluralistic Universe is a product of the mind of William James, thought to be one of the most influential thinkers of the early 19th century. James was known as the father of American psychology and the founder of the school of radical empiricism.

William James propounded his theories of pragmatism in this book. He emphasized "radical empiricism" and the concept that the meaning of any idea - philosophical, political, social, or otherwise - only has validity in terms of its experiential and practical consequences. He wished to test competing systems of thought in the "marketplace of actual experience" to determine whether adopting a particular philosophical theory or way of looking at the world makes an actual difference in individual conduct or in how people perceive and react to the varieties of experience.

William James was one of the most influential figures in 19th-century American philosophy and psychology. His Pragmatism is a set of lectures that he gave in 1906-07 in answer to the enduring debate between empiricism and rationalism. Shifting between them, he proposed pragmatism as a method, the idea being that the value of any truth is dependent upon its utility–upon its practical and experiential consequences.

First published in 1905, The Varieties of Religious Experience is a collection of lectures given at the University of Edinburgh in 1901 and 1902. William James was a psychologist and, as such, his interest in religion was not that of a theologian but of a scientist. In these 20 lectures, he discusses the nature and origin of religious belief. The average believer is one who has inherited his religion, but this will not do for James's inquiry.

A good book may have the power to change the way we see the world, but a great book actually becomes part of our daily consciousness, pervading our thinking to the point that we take it for granted, and we forget how provocative and challenging its ideas once were - and still are. The Structure of Scientific Revolutions is that kind of book.