Revelation 5 tells us that the One seated upon the throne has, in His right hand, a book. Just as the prophet Daniel longed to see thrones established and the books opened (Daniel 7), Revelation 5 focuses on this single book. If only this book can be opened, John writes, God’s people will be rescued.
John was writing to the seven churches of Asia–oppressed and persecuted people who longed for their day of deliverance, for relief from their grief and sorrows. These people knew that if only this book of judgment could be opened, evil would be judged and the people of God would be rescued.