Watchman Nee emphasizes the importance of prayer in co-laboring with God, explaining that while God has a will, He desires His children to pray in alignment with it. He highlights that God's work will not be executed independently without the prayers of believers expressing their unity with Him. Nee illustrates this with the example of a judge who would not avenge a widow without her persistent cries, paralleling it to how God awaits the prayers of His people to act against the devil. The sermon underscores that believers have the authority to accuse Satan based on their persecution, which leads to his ultimate defeat. Ultimately, God delights in His people partnering with Him through prayer.