Satan is one who “transformeth himself nigh unto an angel of light” (2 Nephi 9:9; see also 2 Corinthians 11:14). Elder Bruce R. McConkie has written: “Lucifer does not come personally to every false prophet, as he did to Korihor, any more than the Lord comes personally to every true prophet, as he did to Joseph Smith.
Such an appearance—either of God on the one hand or of Satan on the other—is, however, the end result of full devotion to the respective causes involved. In each instance an earthly representative, by obedience to the laws that are ordained, may see the face of the master he serves.” (Millennial Messiah, p. 72.)