Why on earth, then, are you adding to them in your post?
Because they ARE good enough. It’s all we need.
If anyone chooses not to believe them, that is their choice, but I sure wouldn’t want to be in the position most Catholics will find themselves in of answering to God for why they added to God’s word instead of just trusting Him in it.
What chutzpah, saying the very words of God themselves are not authoritative or authoritative enough.