DID YOU KNOW?
The answer
Ephesians. The seven "undisputed" letters are Romans, 1 and 2 Corinthians, Galatians, Philippians, 1 Thessalonians, and Philemon. Ephesians is one of the disputed letters — its style and vocabulary differ enough that many scholars doubt direct authorship.
Why it’s interesting
That leaves six letters — including Ephesians, Colossians, and the three "Pastorals" — where authorship is argued. The line is drawn mostly from differences in Greek style, theology, and the situations each letter addresses.
Scholarly consensus
You can know the Bible.
Not just the stories, but the history, authorship, and scholarship behind it.