John Nelson Darby emphasizes the vision of God regarding the church in the wilderness, illustrating that despite Israel's failures, God sees them as a peculiar and beautiful people. He highlights that God's calling is irrevocable and that He sees no iniquity in His people, focusing on their beauty through the lens of Christ's righteousness. Darby encourages believers to look beyond their circumstances and failures, recognizing their identity and acceptance in Christ, which leads to peace and communion with God. He also points to the future hope of glory with Christ, urging the church to maintain a vision of its beauty and purpose in God's eyes.