According to Hugh Nibley, a mansion is a house which is yours, and there are many mansions where you stay overnight as you progress on your journey. When a great king or lord made his tour, the Royal Progress, where did he stop at night? He didn't camp; he had mansions. He had special houses built for him to stay overnight. The first year of his reign he had to make the complete tour of his kingdom (see "Tenting, Toll, and Taxing," Western Political Quarterly 1966: 599-630; reprinted in The Ancient State, CWHN 10, F.A.R.M.S., 33-98). The mansion is the place where you stay during the course of your progress on your journey. You continue to have your mansion, and on you go. There you have your eternal progression. [Hugh W. Nibley, Teachings of the Book of Mormon, Semester 1, pp. 422]