11 May you be strengthened with all power, according to his glorious might, for all endurance and patience with joy, 12 giving thanks to the Father, who has qualified you to share in the inheritance of the saints in light. 13 He has delivered us from the domain of darkness and transferred us to the kingdom of his beloved Son, 14 in whom we have redemption, the forgiveness of sins. Colossians 1:11–14, ESV
We live in a time of deep deception. Even genuine Christians can be deceived if they are not exceedingly careful. It is imperative that, even though we must remain in the world for a time, we must not be of it. The Church has been under heavy attack since Acts 2. It is a wise and discerning thing for us to understand that God uses this to purify, cleanse, and teach the Church. It is as we address heresy that doctrine is developed or our understanding of God and His ways becomes more defined for us.