Revelation 20:15 declares, “If anyone’s name was not found written in the book of life, he was thrown into the lake of fire.” The Book of Life is the set of names of those who will live with God forever in heaven. It is the roll of those who are saved. This Book of Life is also mentioned in Revelation 3:5;20:12; and Philippians 4:3. The same book is also called the Lamb’s Book of Life because it contains the names of those who have been redeemed by the blood of the Lord Jesus (Revelation 13:8;21:27).
How can you be sure your name is written in the Book of Life? Be sure you’re saved. Repent of sin and believe in the Lord Jesus Christ as your Savior (Philippians 4:3; Revelation 3:5). Once your name is written in the Book of Life, it is never erased (Revelation 3:5; Romans 8:37-39). No true believer should doubt his eternal security in Christ (John 10:28-30).
The Great White Throne Judgment described in Revelation 20:11-15 is a judgment for unbelievers. Since their names are not in the Book of Life, their fate is sealed, their punishment is sure.
The promise of Revelation 3:5 is clearly states that the Lord will not erase a name: “He who overcomes . . . I will not blot out his name from the Book of Life.” An overcomer is one who is victorious over the temptations, trials, and evils of this world—in other words, one who is redeemed. The saved are written in God’s registry and have the promise of eternal security.