One of the most theologically rich and at the same time practically helpful passage in scriptures is Philippians 3:12-21. The reason I say this is because it shows how we should conduct our lives as Christians,
Finally, my brothers and sisters, rejoice in the Lord! [Because] to write this again is no trouble to me, moreover it is a safeguard for you. [Here’s what I’m writing to you again:] Beware of the dogs, beware of the evil workers, beware of those who mutilate the flesh!