[Should] the church forsake the standard of sound doctrine? On what basis would false teachers be rejected (Rom. 16:17; 2 John 9–10) or false doctrine be refuted (Titus 1:9)? How would believers know what was true and worth holding on to (1 Tim. 3:9; Rev. 2:24)? How would Christians distinguish between right and wrong? How would sin be confronted and corrected?