"When the Eternal Father announced his plan of salvation—a plan that called for a mortal probation for all his spirit children; a plan that required a Redeemer to ransom men from the coming fall; a plan that could only operate if mortal men had agency—when the Father announced his plan, when he chose Christ as the Redeemer and rejected Lucifer, then there was war in heaven. That war was a war of words; it was a conflict of ideologies; it was a rebellion against God and his laws. Lucifer sought to dethrone God, to sit himself on the divine throne, and to save all men without reference to their works. He sought to deny men their agency so they could not sin. He offered a mortal life of carnality and sensuality, of evil and crime and murder, following which all men would be saved. His offer was a philosophical impossibility. There must needs be an opposition in all things. Unless there are opposites, there is nothing. There can be no light without darkness, no heat without cold, no virtue without vice, no good without evil, no salvation without damnation.
"And so, in the courts of heaven, the war of wars was waged. Christ and Michael and a mighty host of noble and great spirits preached the gospel of God and exhorted their brethren to follow the Father. Lucifer and his lieutenants preached another gospel, a gospel of fear and hate and lasciviousness and compulsion. They sought salvation without keeping the commandments, without overcoming the world, without choosing between opposites. And they 'prevailed not; neither was their place found any more in heaven. And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.' And his legions, the legions of hell, are everywhere. They are 'the third part of the stars of heaven,' the one-third of the spirit children of the Father; and they were cast out of their heavenly home because of rebellion. And so the holy word says: 'Woe to the inhabiters of the earth and of the sea! for the devil is come down unto you, having great wrath.' And he goes forth 'to make war' with all men and particularly with those who 'keep the commandments of God, and have the testimony of Jesus Christ.' (Rev. 12:4-17.) And the war that is now going on among men, the war between good and evil, is but a continuation of the war that began in heaven." (Bruce R. McConkie, Millennial Messiah: The Second Coming of the Son of Man, p. 666-667.)