What does it mean that believers are not of the world?

In John 17:16, Jesus states that His disciples are not of the world, even as He is not of the world. This distinction indicates that believers have been called out from the world system to belong to God. It highlights the transformative work of salvation where individuals are spiritually resurrected and given new life. Being 'not of the world' means that while believers live in the world, their true identity and allegiance lie with Christ, and they are to reflect His character and truth in their lives.