Speaking of Himself and His crucifixion, Jesus said,
Verily, verily, I say unto you, Except a corn of wheat fall into the ground and die, it abideth alone: but if it die, it bringeth forth much fruit. (John 12:24)
By allowing Himself to die for us, Christ can bring us unto Him, therefore bringing forth fruit. The metaphor can be applied to ourselves and others though, when He added in the next verse,
He that loveth his life shall lose it; and he that hateth his life in this world shall keep it unto life eternal.
And so, I will apply this to the prophet Joseph Smith. The mobs that continually persecuted the Mormons in the early days of the Church thought they could do away with them, the Mormons. They figured, if they killed Joseph Smith, that would be the end of it all. Unfortunately, for them, they were mistaken.
The martyrdom of Joseph Smith only added more fire and zeal to the testimonies of the early Saints, and they pressed onward, eventually settling in the west. Joseph Smith lost his life, but in doing so he sealed his work with his blood. In the words of a hymn, written by William W. Phelps,
Hail to the Prophet, ascended to heaven!
Traitors and tyrants now fight him in vain.
Mingling with Gods, he can plan for his brethren;
Death cannot conquer the hero again.
The Prophet still lives on. The mobs may have killed his body, but they could never touch his spirit. I bear witness to you, whoever you may be, that Joseph Smith was and still is a prophet of God, and called by Him. Through Joseph Smith, God and Jesus Christ restored The Church of Jesus Christ upon the earth. And by the power and gift of God, Joseph Smith translated the Book of Mormon, which contains the fulness of the everlasting gospel of Jesus Christ. To sum it up, in the words of John Taylor,
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.