John Nelson Darby expounds on the transfiguration of Jesus in Matthew 17, where Jesus reveals His divine glory alongside Moses and Elijah. The sermon emphasizes the significance of this event, highlighting the Father's declaration of Jesus as His beloved Son, distinguishing Him from the law and the prophets. Darby explains that while Moses and Elijah represent the law and the prophets, they ultimately fade away, leaving Jesus as the sole authority and object of faith. The sermon also addresses the disciples' struggle with faith and their inability to utilize the power of Christ, culminating in a call to recognize Jesus' unique role as the Son of God and the necessity of faith in accessing His power. Darby concludes by affirming that Jesus, though rejected, will return in glory, fulfilling God's promises.