so when people read in revelation 22:1819 for i testify unto every man that heareth the words of the prophecy of this book , if any man shall add unto these things , god shall add unto him the plagues that are written in this book : and if any man shall take away from the words of the book of this prophecy , god shall take away his part out of the book of life , and out of the holy city , and from the things which are written in this book , people often misunderstand it .