I think the previous reviewer was somewhat missing the point of James' thought. Essentially we create truths by discourse and truth does not exist independently of human existence. Therefore whatever we will to believe is true in as much as it is socially agreed. For instance although scientists may 'prove' something to be true, in fact the scientist is merely using a tautological method of proving that which is true by a method that has been shown to prove that the 'fact' is true. Confusing? Yes but the movement through history is one of changes in our belief systems and essentially our truths. I suggest a perusal of some of the post-positivist thought published to get a handle on this fascinating debate. Key names are Imre Lakatos, Thomas Kuhn and Richard Rorty. It is a very rewarding and fascinating way of looking with new eyes on the world.