In the Book of Mormon we read that Aaron went to preach to the Amalekites. One man contended with him, saying they had no need to repent. He said he believed that God would save all men and accused Ammon of believing in false and foolish traditions. He said he didn't believe that Aaron could know of things to come. Alma 21: 4-8 "And it came to pass that Aaron came to the city of Jerusalem, and first began to preach to the Amalekites. And he began to preach to them in their synagogues, for they had built synagogues after the order of the Nehors; for many of the Amalekites and the Amulonites were after the order of the Nehors. Therefore, as Aaron entered into one of their synagogues to preach unto the people, and as he was speaking unto them, behold there arose an Amalekite and began to contend with him, saying: What is that thou hast testified? Hast thou seen an angel? Why do not angels appear unto us? Behold are not this people as good as thy people? Thou also sayest, except we repent we shall perish. How knowest thou the thought and intent of our hearts? How knowest thou that we have cause to repent? How knowest thou that we are not a righteous people? Behold, we have built sanctuaries, and we do assemble ourselves together to worship God. We do believe that God will save all men. Now Aaron said unto him: Believest thou that the Son of God shall come to redeem mankind from their sins? And the man said unto him: We do not believe that thou knowest any such thing. We do not believe in these foolish traditions. We do not believe that thou knowest of things to come, neither do we believe that thy fathers and also that our fathers did know concerning the things which they spake, of that which is to come."
In the Old Testament we read that war and desolation will precede the Second Coming of Jesus Christ. Joel 2:1-11 "Blow ye the trumpet in Zion, and sound an alarm in my holy mountain: let all the inhabitants of the land tremble: for the day of the Lord cometh, for it is nigh at hand; A day of darkness and of gloominess, a day of clouds and of thick darkness, as the morning spread upon the mountains: a great people and a strong; there hath not been ever the like, neither shall be any more after it, even to the years of many generations. A fire devoureth before them; and behind them a flame burneth: the land is as the garden of Eden before them, and behind them a desolate wilderness; yea, and nothing shall escape them. The appearance of them is as the appearance of horses; and as horsemen, so shall they run. Like the noise of chariots on the tops of mountains shall they leap, like the noise of a flame of fire that devoureth the stubble, as a strong people set in battle array. Before their face the people shall be much pained: all faces shall gather blackness. They shall run like mighty men; they shall climb the wall like men of war; and they shall march every one on his ways, and they shall not break their ranks: Neither shall one thrust another; they shall walk every one in his path: and when they fall upon the sword, they shall not be wounded. They shall run to and fro in the city; they shall run upon the wall, they shall climb up upon the houses; they shall enter in at the windows like a thief. The earth shall quake before them; the heavens shall tremble: the sun and the moon shall be dark, and the stars shall withdraw their shining: And the Lord shall utter his voice before his army: for his camp is very great: for he is strong that executeth his word: for the day of the Lord is great and very terrible; and who can abide it?"
Some scriptures with a thought booklet tell us that when we promise to keep the Lord's words and seek His favor with all our heart, He will be merciful unto us, according to His promise. Psalms 119:57-58 "Thou art my portion, O Lord: I have said that I would keep thy words. I entreated thy favour with my whole heart: be merciful unto me according to thy word."