2Ti 3:16 All scripture [is] given by inspiration of God, and [is] profitable for doctrine, for reproof, for correction, for instruction in righteousness:
Let it be noted that this verse was not scripture when it was written. It was merely part of a letter. It was referring to other scripture.
Rev 22:18 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:
Rev 22:19 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.
The words of warning about adding or taking away of the words of this book, is referring to the book of Revelation. Nowhere does it state in the bible about not adding to the bible. Maybe 500 years from now, Andrew Urshan's book would be considered for cannon! Who knows?