Smithsonian Institute
"The evaluation of Sunday, the traditionally accepted day of the resurrection of Christ, has varied greatly throughout the centuries of the Christian Era. From time to time it has been confused with the seventh day of the week, the Sabbath. English speaking peoples have been the most consistent in perpetuating the erroneous assumption that the obligation of the fourth commandment has passed over to Sunday. In popular speech, Sunday is frequently, but erroneously, spoken of as the Sabbath." -F. M. SETZLER, Head Curator, Department of Anthropology, Smithsonian Institute, from a letter dated Sept. 1, 1949.