Gal 1:8 "But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.Gal 1:9 As we said before, so say I now again, If any [man] preach any other gospel unto you than that ye have received, let him be accursed."
And that which is not included in the scriptures is indeed another gospel. - All that is peculiar to the RC stands in defiance to the writings of Paul.
But even more pointed are the words recorded by John:
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: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."
But these writings will mean nothing to those who "have no ear," will they?