The Book of Life is God's own registry, recording the names and details of each person, and it precedes every human system of record-keeping. Scripture refers to it in Luke 10:20, Hebrews 12:23, Daniel 12:1, Malachi 3:16, and Revelation 21:27. God will use it in judgment: the dead are judged by what is written in the books, and anyone not found written in the Book of Life is cast into the lake of Fire (Revelation 20:12, 15). The Greek biblion zoe and the Hebrew sepher and chay point to a book or register of the living. Though some scholars separate the Book of Life from a Book of the Living, the two share the same purpose and function. John saw books opened and was told to write what he saw, so the Book of Life should be understood as a literal book, even if it also represents God's will and judgment for all men. God does not need it to jog His memory. It exists for His children's benefit and shows that He is a God of order who keeps meticulous records of their lives (1 Corinthians 14:33, 40; Hebrews 6:10). It also gives real-life urgency to overcoming. Christ tells each of the seven churches that those who overcome their sinful natures will have their names in it (Revelation 2 and 3). There is no eternal security, however. God will blot out the name of anyone who turns away from his commitment (Revelation 3:5; 22:19; Exodus 32:33; Deuteronomy 29:20).

The concept of the Book of Life emerges as a critical element in the process of eternal judgment, where God, the great Judge of all the universe, determines the fate of every individual. In this judgment, as described, all humans will ultimately stand before the judgment seat of Christ, where Jesus, appointed by God the Father, will judge with fairness and righteousness, filled with the Spirit of God, using true knowledge, understanding, and wisdom. During the Great White Throne Judgment, which occurs after a period of resurrection, individuals will be judged according to the things written in the books, which represent the Word of God, the standard of righteousness for all. Those who are part of the second resurrection, raised to physical life in a peaceful world, will also be assessed by this same criterion during their hundred-year period of opportunity to learn and accept His way. Furthermore, in a third resurrection, the incorrigibly wicked, who refuse to live by God's laws and reject repentance, will face judgment. Their fate, as recorded in the context of the Book of Life, leads to being cast into the Lake of Fire, where they are completely burned up, unable to be resurrected again, having spurned His offer of salvation and eternal life.

The Last Great Day embodies God's grace and fairness, envisioning a time of perfect justice where each person receives a chance for salvation under favorable conditions, free from deception. This day anticipates the ultimate eradication of evil and the second death, also known as the Lake of Fire or the third resurrection, where all wickedness will be eternally removed, allowing God Himself to dwell with humanity. In this context, the Book of Life holds profound significance as it pertains to the judgment during the general resurrection, described in Revelation 20. This resurrection, following the Millennium and Satan's final rebellion, involves all the dead, small and great, standing before God's throne. Here, the Book of Life serves as a record in the judgment process, determining who will be welcomed into God's Family and who will face the Lake of Fire. This judgment offers the last, yet best, chance for salvation, ensuring that if individuals please God and live according to His way, their names are secured in the Book of Life, symbolizing their acceptance into eternal life with Him.

The Book of Life determines who is spared the Lake of Fire. In the third and final resurrection, the incorrigibly wicked are raised from the sea, from death without burial, or from graves in the ground, and God Himself sentences them. Whoever is not found written in the Book of Life is cast into the Lake of Fire and burned up in the second death (Revelation 20:11-15). Those whose names are absent are people who, after coming to the knowledge of the truth, willfully sin and reject God's way, and who trample the sacrifice of His Son. By the time of this resurrection all humanity has had the opportunity for salvation and everyone's destiny is eternally set, so no one can change his fate. God does not want anyone to perish and desires all to come to repentance, but those who refuse His mercy leave Him no alternative but to put them to death for eternity. Those who obey, serve God the Father and Jesus Christ, and overcome their sins are written in the Book of Life and inherit all things, living eternally as glorified sons of God in the new earth where righteousness dwells.