I wanted to add this quote here too.

“Herein lies the safety of all believers and all churches, namely, to keep themselves steadfastly in the complete revelation of divine truth in the Word of God. Let men pretend what they will, and bluster what they please, in an adherence unto this principle we are safe; and if we depart from it, we shall be carried about though innumerable uncertainties unto ruin.”

John Owen, Hebrews 13:9