Traditionally, Lutherans have categorized the NT into homologoumena and antilegomena (I believe the East uses this same view as well. Maybe an EO poster can correct that if I am wrong). The former would include the Gospels, Acts, the Pauline Epistles, 1 John, and 1 Peter. These, because they were never disputed as non-canonical, are where doctrine is primarily derived from. The antilegomena would be 2 Peter, Hebrews, 2 & 3 John, James, and Revelation. Because of their early disputed status, they are not where doctrine is primarily drawn from, but rather, confirms the doctrine taught in the homologoumena
And yet, peculiarly, the Scriptures do not say “that which was disputed may be considered peripheral.”
Another non-Scriptural tenet that’s being espoused by SS advocates!