Psychologists of religion pursue three major projects: (1) systematic description, especially of religious contents, attitudes, experiences, and expressions; (2) explanation of the origins of religion, both in the history of the human race and in individual lives, taking into account a diversity of influences; and (3) mapping out the consequences of religious attitudes and conduct, both for the individual and for society at large. The psychology of religion first arose as a self-conscious discipline in the late 19th century, but all three of these tasks have a history going back many centuries before that.