This sermon examines the third petition of Christ's high priestly prayer, focusing on the unity of believers as described in John 17. The central argument posits that Christian unity is grounded in three shared realities: a common gospel, a common glory, and a common goal. The common gospel refers to the apostolic message that unites Jews and Gentiles into one body, while the common glory is identified as the indwelling Holy Spirit who conforms believers to the image of Christ. The sermon distinguishes between the invisible, positional unity of the church and the visible, practical unity that must be actively maintained through humility and love. Ultimately, this visible unity serves as a witness to the world, demonstrating the Father's love for His people and convincing unbelievers that Jesus is the Messiah sent by God.