Watchman Nee emphasizes the importance of understanding our identity in Christ, particularly the truth that our old self was crucified with Him. He explains that true reckoning of being dead to sin must be based on the knowledge of this fact, rather than mere attempts to reckon without understanding. Nee shares his personal journey of revelation, where he realized that his death with Christ was a past event, leading to a joyful acceptance of his new identity. He warns against the dangers of relying on feelings or experiences rather than the unchanging truth of God's Word. Ultimately, he encourages believers to abide in Christ, where they can experience the reality of their new life and victory over sin.