John Nelson Darby emphasizes the significance of Jesus as the Good Shepherd in the context of His ministry to Israel, illustrating how His role is not just to lead but to provide salvation and security to His flock. He explains that the fold represents the religious system of Israel, which was failing to recognize the true Shepherd, leading to a moral testing of the nation. Darby highlights the dual effect of Christ's ministry: drawing those who accept Him while exposing the hearts of those who reject Him. He contrasts the Good Shepherd's selfless love with the hireling's abandonment, affirming that true security and sustenance come from following Christ, who offers eternal life and protection. Ultimately, the sermon calls believers to recognize their relationship with Christ, the Shepherd who knows them intimately and secures their salvation.