Book of Mormon Prophecies, Warner, pp. 53-55; D&C 135:3
“Joseph Smith was martyred in Carthage, Illinois, on the 27th of June, 1844—14 years after the organization of the Church. What did he accomplish in these 14 years? He opened up communication with the heavens in his youth. He brought forth the Book of Mormon, which contains the fullness of the Gospel; and the revelations contained in the Book of Doctrine and Covenants; restored the holy Priesthood unto man; established and organized the Church of Jesus Christ of Latter-day Saints, an organization which has no parallel in all the world, and which all the cunning and wisdom of men for ages has failed to discover or produce and never could have done He founded colonies in the States of New York, Ohio, Missouri and Illinois, and pointed the way for the gathering of the Saints into the Rocky Mountains; sent the Gospel into Europe and to the Islands of the sea; founded the town of Kirtland, Ohio, and there built a temple that cost about a quarter of a million of dollars; he founded the city of Nauvoo in the midst of persecution; gathered into Nauvoo and vicinity some 20,000 people, and commenced the building of the temple there, which when completed cost one million dollars; and in doing all this he had to contend against the prejudices of the age, against relentless persecution, mobocracy and vile calumny and slander, that were heaped upon him from all quarters without stint or measure. In a word, he did more in 14 to 20 years for the salvation of man than any other man save Jesus only, that ever lived… .” (Joseph F. Smith, Journal of Discourses 24:14-15)