Joseph F. Smith (Church President: October 17, 1901 - November 19, 1918)

There is just one power, and one only, that can prevent war among the nations of the earth, and that is true religion and undefiled before God, the Father. Nothing else will accomplish it. ... There is but one remedy that can prevent men from going to war, when they feel disposed to do it, and that is the Spririt of God, which inspires to love, and not to hatred, which leads unto all truth, and not unto error, which inclines the children of God to pay deference to him and to his laws and to esteem them as above all other things in the world.

The Lord has told us that ... wars would come. We have not been ignorant that they were pending, and that they were likely to burst out upon the nations of the earth at any time. We have been looking for the fulfilment of the words of the Lord that they would come. Why? Because the Lord wanted it? No; not by any means. Was it because the Lord predestined it, or designed it, in any degree? No, not at all. Why? It was for the reason that men did not hearken unto the Lord God, and he foreknew the results that would follow, because of men, and because of the nations of the earth; and therefore he was able to predict what would befall them, and came upon them in consequence of their own acts, and not because he had willed it upon them, for they are but suffering and reaping the results of their own actions.
Joseph F. Smith (2000-2001 Priesthood/R.S. Manual - page 401)

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We are all babes in [the principle of faith]. We are only beginning, the best of us, to know something of this principle of life and salvation, this principle of power. By faith, we are told, the worlds were made. Who of us have faith to do much of anything? Our faith is so limited that we can scarcely live the little principles of the gospel that God has revealed to us that are necessary for social peace and enjoyment. We have scarcely faith to carry out these little principles that are revealed to us for the government of our every day lives.

The Lord has to bear with us and to be patient with us and to teach us here a little and there a little, line upon line and precept upon precept that we may eventually gain that faith that was once delivered to the Saints by which the mouths of lions were stopped, and the heat of the fiery furnace was assuaged ... Our great teacher, Jesus Christ, ... is trying to teach us the principles of life and salvation which are principles of power, teaching men to rise from the depths of sorrow, from the depths of humanity to the heights of glory and knowledge of God.
Joseph F. Smith (2000-2001 Priesthood/R.S. Manual - page 52)

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It would be immeasurably better for us to lay down our bodies now, in the faith of the Gospel, than to live to ripe old age and turn away from it, thereby forfeiting our claim upon eternal life.

If we live and turn away from the truth we will be separated throughout the countless ages of eternity from the society of those we love. We will have no claim upon them, and they will have no claim upon us. There will be an impassable gulf between us over which we can not pass, one to the other.

If we die in the faith, having lived righteous lives, we are Christ’s, we have the assurance of eternal reward, being in possession of the principles of eternal truth and shall be clothed with glory, immortality and eternal lives. While we sojourn in the flesh we pass a great portion of our life in sorrow; death separates us for a short time, some of us pass behind the vail, but the time will come when we will meet with those who have gone, and enjoy each other’s society forever. The separation is but for a moment as it were. No power can separate us then. God having joined us together we have a claim upon each other—an undeniable claim—inasmuch as we have been united by the power of the priesthood in the Gospel of Christ. Therefore it is better to be separated in this life for a little season, although we have to pass through deprivation, sorrow, trouble, toil, widowhood, orphanage and many other vicissitudes, than to be separated for all eternity.
Joseph F. Smith (2000-2001 Priesthood/R.S. Manual - page 52)

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We should have gained sufficient experience by this time to realize that no man, no individual, no clique, and no secret organization can combine with force and power sufficient to overturn the purposes of the Almighty; or to change the course of His work.
Joseph F. Smith (2000-2001 Priesthood/R.S. Manual - page 114)

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I want to say to you that there never was a time since the organization of the Church of Jesus Christ of Latter-day Saints, when a man led the Church, not for one moment. It was not so in the days of Joseph [Smith], it was not so in the days of Brigham Young; it has not been so since; it never will be so. The direction of this work among the people of the world will never be left to men. it is God's work.
Joseph F. Smith (2000-2001 Priesthood/R.S. Manual - page 221)

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No man will lead God's people nor his work. God may choose men and make them instruments of his hands for accomplishing his purposes, but the glory and honor and power will be due to the Father, in whom rests the wisdom and the might to lead his people and take care of his Zion. I am not leading the Church of Jesus Christ, nor the Latter-day Saints, and I want this distinctly understood. No man does ... Remember that God leads the work. It is his. It is not man's work. If it had been the work of Joseph Smith, or of Brigham Young, or of John Taylor, Wilford Woodruff or Lorenzo Snow, it would not have endured the tests to which it has been subjected.
Joseph F. Smith (2000-2001 Priesthood/R.S. Manual - page 222)

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Now, so long as the Latter-day Saints are content to obey the commandments of God, to appreciate the privileges and blessings which they enjoy in the Church, and will use their time, their talents, their substance, in honor to the name of God, to build up Zion, and to establish truth and righteousness in the earth, so long our heavenly Father is bound by His oath and covenant to protect them from every opposing foe, and to help them to overcome every obstacle that can possibly be arrayed against them or thrown in their pathway.
April, 1883 General Conference; Journal of Discourses, 24:176