Here are two interesting verses. Apparently "in times before" the Lord had promised the brother of Jared that he would show him the prophetic history of the world. The Lord even promised in his "own due time" to show these things "unto the children of men."
“Until the Lord Should Show Them Unto the Children of Men”
The Lord also made it known that two sacred stones which the brother of Jared was commanded to show unto no one, would one day be shown by the Lord to mankind in his own due time.
We know some additional details concerning the two sacred stones which the Lord assures us are the ones he gave to the brother of Jared. To begin with, the Urim and Thummim which Joseph Smith received from Moroni are identical with the two stones given to the brother of Jared. We read in Doctrine and Covenants 17:1 that "the Urim and Thummim," which were given to Joseph Smith by the angel Moroni, "were given to the brother of Jared upon the mount when he talked with the Lord face to face."
William Smith described the Urim and Thummim as being set in a bow "which was twisted into the shape of a figure 8, and the two stones were placed the two rims of the bow. At one end was attached a rod which was connected with the outer edge of the right shoulder of the breast plate. By pressing the head a little forward, the rod held the Urim and Thummim before the eyes like a pair of spectacles. A pocket was prepared in the breast plate on the left side immediately over the heart. When not in use, the Urim and Thummim was place in the pocket, the rod being of just the right length to allow it to be deposited."3