Watchman Nee emphasizes that God's protection is conditional and requires active participation from believers. He explains that while trusting God, one must also recognize and fulfill the conditions necessary for divine protection, as neglecting these can lead to the adversary's attacks. Believers are called to be vigilant, resisting the enemy and maintaining a watchful spirit to prevent yielding to darkness. By understanding the spiritual realm and the tactics of the enemy, Christians can reclaim their strength and experience victory in their lives. Ultimately, this awareness is crucial for the preparation of the Church for Christ's return.