Scripture & Authority
Scripture and Tradition
God's Word comes to us through both the written Scriptures and the living apostolic Tradition, guarded by the Church. ‘Bible alone’ (sola scriptura) is nowhere taught in the Bible — and it can't even tell us which books belong in the Bible.
Scripture endorses apostolic Tradition
Paul commands the Thessalonians to hold fast to the traditions he handed on ‘whether by word or by letter,’ and tells Timothy to entrust that deposit to reliable men who will teach others. The faith is a living handing-on, not only a text.
The Church is the pillar of truth
Paul calls the Church — not the Bible — ‘the pillar and support of the truth.’ Christ founded a teaching Church with authority to bind and loose, and promised the Spirit would guide it into all truth.
Scripture needs authoritative interpretation
Peter warns that Scripture is not a matter of one's own private interpretation and that the unstable twist Paul's hard passages to their own destruction. The Ethiopian needed someone to guide him. A text can be misread; that's why Christ left a Church.
Common objections
“2 Timothy 3:16–17 — Scripture makes the man of God ‘complete,’ so it's sufficient.”
It says Scripture is ‘profitable’ and equips — not that it is the ONLY rule. By the same logic the passage proves too much: the ‘Scripture’ Timothy knew ‘from childhood’ was the Old Testament, which would exclude the New. Being profitable isn't the same as being sufficient-by-itself, and the verse never says ‘alone.’
“Tradition is condemned — Jesus rebuked the ‘traditions of men’ (Mark 7).”
He condemned human traditions that NULLIFY God's word — not apostolic Tradition, which Paul commands us to keep. Scripture distinguishes the two: the traditions of men (Mark 7:8) versus the traditions handed on by the apostles (2 Thessalonians 2:15).
Scripture quoted verbatim from the World English Bible (public domain).