Once a person believes in Christ, he or she becomes an overcomer and will never have their name removed from the Book of Life: "The one who conquers will be clothed thus in white garments, and I will never blot his name out of the book of life.
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It is a gift that comes through faith in Jesus. No amount of works can earn a spot in the Book of Life.
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And this is not your own doing it is the gift of God, not a result of works, so that no one may boast" (Ephesians 2:8-9). How can you make sure your name is included in the Book of Life? This takes place by believing in Jesus Christ as Savior: "For by grace you have been saved through faith. The most important place your name could ever be written is in this book. In Philippians 4:3 the apostle Paul also seems to refer to this same book, stating, "Yes, I ask you also, true companion, help these women, who have labored side by side with me in the gospel together with Clement and the rest of my fellow workers, whose names are in the book of life." Paul referred to these believers as people whose names are in the Book of Life.
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This book will be opened on the final day of judgment (Revelation 20:12) and those not found in it will be thrown into the lake of fire. The Book of Life is described in Revelation 20:15 with these words: "And if anyone's name was not found written in the book of life, he was thrown into the lake of fire." It is also mentioned in Revelation 3:5 as a book from which believers will never be removed.