The sermon describes the Great White Throne judgment of Revelation 20: the dead, great and small, standing before God to be judged according to their deeds recorded in the books, with death and Hades themselves finally cast into the lake of fire.
It connects this to Paul’s reminder that ‘we must all appear before the judgment seat of Christ’ (2 Cor. 5:10), and to the Jewish idioms and metaphors used in Revelation’s imagery, urging hearers to be certain their names are written in the Book of Life rather than facing judgment for their works alone.