فَاثْبُتُوا إِذًا أَيُّهَا الإِخْوَةُ وَتَمَسَّكُوا بِالتَّعَالِيمِ الَّتِي تَعَلَّمْتُمُوهَا، سَوَاءٌ كَانَ بِالْكَلاَمِ أَمْ بِرِسَالَتِنَا.
(تسالونيكي الثانية٢ :١٥ )

Do your best to present yourself to God as one approved,
a workman who does not need to be ashamed and
who correctly handles the word of truth.

(2 Timothy 2:15, NIV)