The Book of Life is the book God and Jesus Christ have that records the names of those who are saved. Those whose names are not written in the Book of Life are cast into the Lake of Fire. This Book is used at the Great White Throne judgment in "Kingdom Come".
It is not known whether the Book of Life is updated throughout history, or written at the beginning of it and never modified afterwards. There are no recorded attempts for the unsaved to argue about its contents; instead, all those who are unsaved, including great philosophers and legislators, limit themselves to lamenting their fate and passively going into the Lake of Fire.