The phrase “lake of fire and brimstone” is repeatedly mentioned in the scriptures (Revelation 19:20; 20:10; 2 Nephi 9:16, 19, 26; 28:23; Jacob 3:11; 6:10; Mosiah 3:27; Alma 12:17; 14:14; D&C 76:36). This phrase is generally used to describe either the place that awaits the unrepentant individual after the Judgment or the mental anguish associated with sin.
In reference to the place that awaits those who are unrepentant, modern revelation states: “[The wicked] shall go away into the lake of fire and brimstone, with the devil and his angels” (D&C 76:36).
In reference to mental anguish, the Prophet Joseph Smith (1805–44) said: “A man is his own tormentor and his own condemner. Hence the saying, They shall go into the lake that burns with fire and brimstone. The torment of disappointment in the mind of man is as exquisite as a lake burning with fire and brimstone” (History of the Church, 6:314).