Sometime after 1828, Smith and his early contemporaries began to use the terms "seer stone" and "Urim and Thummim" interchangeably, referring to Smith's brown stone as a "Urim and Thummim." D. Michael Quinn argues Smith eventually began using "biblical terminology to mainstream an instrument and practice of folk magic... There was no reference to the Urim and Thummim in the headings of the Book of Commandments (1833) or in the headings of the only editions of the Doctrine and Covenants prepared during Smith's life." Early Mormons often referred to Smith's seer stone as "the Urim and Thummim," and Quinn refers to the term "Urim and Thummim" as a "euphemism for Joseph Smith's seer stone." The LDS Church has suggested that Smith and others "seem to have understood the term and Thummim more as a descriptive category of instruments for obtaining divine revelations and less as the name of a specific instrument".