[metmom]

St. Paul in his letters also warns the faithful to hold fast to the tradition they received: “We command you, brothers, in the name of the Lord Jesus Christ, to avoid any brother who wanders from the straight path and does not follow the tradition you received from us” (2 Th 3, 6).

Just what are those traditions Paul was referring to that he handed down that we are to keep that were not included in Scripture?

How do you know?

How do you know they’re from the apostles, Paul in particular?

How do you know they’ve been passed down faithfully?

What is your source for verifying all of the above?

Please provide the sources for verification purposes.

[St_Thomas_Aquinas]

How do you know?

Jesus?

Then Jesus came to them and said, “All authority in heaven and on earth has been given to me. Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, and teaching them to obey everything I have commanded you."

Jesus could have told his disciples to hand out Bibles. But nowhere in the Bible is such a commission recorded.

"If he will not listen to the church, treat him as a pagan or tax collector." --Jesus

"...the church of the living God, which is the pillar and foundation of truth." -- St. Paul

[Steelfish]

You answer your own question. So now its “how do you know”?

This is why we have Petrine authority. Not the Biblical chaos that results from its denial.