Well it is obvious the gospel message is included in that:
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.
Just my opinion but what would make anyone think they are smart enough to improve God's Word?