How does God reveal His arm?

The revelation of God's arm signifies His power and intervention in the lives of believers, primarily fulfilled through the person of Jesus Christ. As the sermon highlights, the question posed in Isaiah 53, 'To whom hath the arm of the Lord been revealed?' underscores God's active will to make Himself known. This revelation occurs through the preaching of the gospel, where the Holy Spirit empowers the message, enabling those who hear to respond in faith. God’s revelation is necessary for understanding and believing in the gospel, making faith itself a miraculous act of divine grace.