A.B. Simpson emphasizes the promise of God that if we resist the devil, he will flee from us, highlighting the importance of standing firm against our adversary. He draws a parallel between a citizen seeking protection from their government and believers claiming God's protection against Satan. Simpson warns against giving the enemy power through disobedience and stresses the necessity of being equipped with the breastplate of righteousness and the shield of faith to effectively resist spiritual forces. He encourages believers to boldly claim their redemption rights and experience the power of Jesus' name.