Andrew Murray emphasizes that it is God who establishes us in Christ, highlighting the importance of faith in allowing God to work in our lives. He encourages believers to cease their own striving and trust in God's omnipotence to maintain their connection with Christ. Murray reassures that through faith, believers can experience peace and rest, knowing that God is actively working to strengthen their spiritual lives. He reminds us that the Holy Spirit aids in our remembrance of God's promises, enabling us to surrender our anxieties about spiritual growth to Him. Ultimately, Murray calls believers to confidently expect God's work in their lives, leading to a deeper union with Christ.