How do we know that Christians are called to engage with the world?

The calling of Christians to engage with the world is evident in Christ's command in John 17:18. He emphasizes that their mission includes a distinct purpose — to oppose the sinful attributes of the world and reflect His glory in their lives. This engagement is not a call to acquiesce to the world's ideals but rather to hold firm to the truth of the gospel, revealing the emptiness and evil present in worldly pursuits. By living out their faith authentically among those who do not know Christ, believers witness to the transformative power of the gospel and draw others towards salvation through their example and testimony.