[Charles C. Rich]
It was a long time after the Prophet Joseph Smith had received the keys of the kingdom of God, and after Hyrum [Smith] and others had received many blessings, that the Lord gave Joseph a revelation, to show him and others how they could ask for and receive certain blessings. We read in the [R]evelations of St. John, that the Saints are to receive a white stone, "and in the stone a new name, which no man knoweth save him that receiveth it." Joseph tells us that this new name is a key-word, which can only be obtained through the endowments. This is one of the keys and blessings that will be bestowed upon the Saints in these last days, for which we shall be very thankful.
[Source: Charles C. Rich discourse, Feb. 10, 1878 , Journal of Discourses, 19:250, in Anderson, Devery; The Development of LDS Temple Worship, 1846-2000: A Documentary History, http://amzn.to/TempleWorship]