Watchman Nee emphasizes the distinctiveness of believers in Christ, highlighting that their origin is from above, while the world is beneath. He explains that Christians are 'called-out ones,' chosen by God to live a life that is fundamentally different from the world, which cannot produce true Christians. Nee illustrates that this divine life within believers is a barrier against the world's influence, and that their identity is rooted in being part of the Body of Christ. He reassures that while Christians live in the world, they are not of it, and their distinctiveness is a safeguard against worldly absorption. Ultimately, believers are called to engage with the world, reflecting their heavenly origin and the life of Christ within them.