Provost, Denison University, Granville, Ohio 43023. Delivered June 10, 2007, as the History of Economics Society Presidential Address at George Mason University. I would like to thank Steven G. Medema and Roger E. Backhouse, both of whom took time to talk to me about the possible topic of my address before I started to work on it and both of whom read versions of it while it was in draft. Henry Rietz in the Grinnell College Religious Studies Department also took to time to discuss the address with me after it was drafted. I alone bear responsibility for errors of fact and interpretation.