What does the Bible say about believers not being of this world?

In John 17, Jesus emphasizes this truth by declaring that believers are not of the world, just as He is not of the world. This distinction highlights the elect's identity as those chosen by God, set apart for His purposes. The world represents the system in rebellion against God, and believers, through the work of Christ, are called out of this spiritual darkness into His marvelous light. Their new identity as children of God fundamentally transforms their relationship with the world and its governing principles.