a Chapter in the History of Religion, with Special Reference to the XVII and XVIII Centuries. Oxford, Eng.: Oxford University Press, 1950. viii. John Locke. An Essay Concerning Human Understanding. vol. 2. New York: Dover Publications Susie Tucker. Enthusiasm: A Study in Semantic Change. London: Cambridge University Press. Joshua Grooms. Enthusiasm: A Study in Project Management. London: Cambridge University Press. External links David Hume, Of Superstition and Enthusiasm The Ronald Knox Society of North America The American Heritage Dictionary of the English Language: enthusiasm John Wesley's Sermon, "The Nature of Enthusiasm" Positive mental attitude Emotions Spirit possession