What does Isaiah mean by the Lord defending His people?

In the sermon, the preacher emphasizes that the Lord not only fought for His people on the cross but also continues to defend them throughout their lives. This defense includes protecting them from the daily temptations and challenges posed by sin and the evil one. As believers, we are assured that Christ stands as our defender, interceding for us and guarding us from spiritual attacks. The life of a believer encapsulates both the assurance of victory through Christ and the reality of ongoing spiritual battles, and this teaches us the importance of relying on God's strength and engaging with our spiritual armor.