If we compare the thought pattern of Jonathan Edwards (and John Piper, for he agrees fully with Edwards) to that of Joseph Smith, the author of the Book of Mormon, we can plainly see that both men believe that it is not possible for knowledge of righteousness and holiness to exist and be understood, (and even going so far as stating righteousness and holiness cannot exist) without the existence of evil and wickedness.
As we can see in the particular excerpts, Lucifer was a covering cherub of the throne of God, and was made highly intelligent, very beautiful, very talented, and very powerful. Unfortunately, all this ability and beauty got to him and Lucifer became proud of who and what he was, forgetting who made him: he then set about to turn all Heaven against the LORD God. As a result, a full third of the angelic host believed Lucifer over the LORD God and chose to follow him. They were summarily cut off and cast down, eternally condemned awaiting the Lake of Fire. For the fallen angels, there is no hope of reconciliation with the LORD God, they are forever lost, bound for destruction.
An examination of Mormon teaching as contained in the Book of Mormon addressing the relationship of good and evil. This article demonstrates that Joseph Smith picked up Taoism and incorporated into the Book of Mormon as a way of explaining how evil can exist.