The beast that you saw lived previously. Eventually God will destroy him, but now he is dead. He is about to come up ◄from the underworld/from the deep dark pit►. When the beast who had previously lived, and who then had died, reappears, the people who live on the earth will be amazed. They are people whose names were not in the book in which are written the names of people who will have eternal life. The angels have been writing those names in a list ◄from the beginning of the world/from the time when the world began►.