Verse 7 states that "he [the seer Joseph Smith] shall be esteemed highly among the fruit of thy loins … [and] he shall do a work for the fruit of thy loins." While his name will be known throughout the world for good or for ill, it was foreseen that the descendants of Joseph, Ephraim and Manasseh, would esteem Joseph Smith highly. Indeed, many who have come into the restored Church of Jesus Christ have discovered through their patriarchal blessings that they are the fruit of the loins of Joseph, and they also know that he is a true prophet. They sing with enthusiasm, "Praise to the man who communed with Jehovah."
Brigham Young said, "I feel like shouting hallelujah all the time when I think that I ever knew Joseph Smith." His work was to translate the Book of Mormon by the gift and power of God, and Doctrine and Covenants 135:3 states that "Joseph Smith, the Prophet and Seer of the Lord, has done more, save Jesus only, for the salvation of men in this world, than any other man that ever lived in it."
Book of Mormon Central, "How Can We Know What to Believe about Joseph Smith’s Personal Character? (3 Nephi 18:1)," KnoWhy 413 (March 6, 2018).