Before the Son of man appears in the clouds of heaven, everything in nature will be convulsed. Lightning from heaven uniting with the fire in the earth, will cause the mountains to burn like a furnace, and pour out their floods of lava over villages and cities. Molten masses of rock, thrown into the water by the upheaval of things hidden in the earth, will cause the water to boil and send forth rocks and earth. There will be mighty earthquakes and great destruction of human life. But as in the days of the great Deluge Noah was preserved in the ark that God had prepared for him, so in these days of destruction and calamity, God will be the refuge of His believing ones ... [Psalm 91:9, 10; 27:5 quoted] (Letter 258, 1907).

 The hand of Omnipotence is at no loss for ways and means to accomplish His purposes. He could reach into the bowels of the earth and call forth His weapons, waters there concealed, to aid in the destruction of the corrupt inhabitants of the old world....
 Water will never destroy the earth again, but the weapons of God are concealed in the bowels of the earth, which He will draw forth to unite with the fire from heaven to accomplish His purpose in the destruction of all those who would not receive the message of warning and purify their souls in obeying the truth and being obedient to the laws of God (The Signs of the Times, January 3, 1878).
 (Psalm 144:5, 6; Nahum 1:5, 6.) Destruction by Water and Fire—In the bowels of the earth God has in reserve the weapons that He will use to destroy the sinful race. Since the Flood, God has used, to destroy wicked cities, both the water and the fire that are concealed in the earth. In the final conflagration God will in His wrath send lightning from heaven that will unite with the fire in the earth. The mountains will burn like a furnace, and pour forth streams of lava [Nahum 1:5, 6; Psalm 144:5, 6 quoted] (Manuscript 21, 1902).