T. Austin-Sparks emphasizes that the Letter to the Philippians reveals how the Cross makes Christ our all, urging believers to approach it with humility and a recognition of their own spiritual shortcomings. He highlights Paul's declaration, 'For me to live is Christ,' illustrating that true life is found in Christ alone, and that the Cross leads to a disinterestedness that allows the Holy Spirit to work freely in our lives. Sparks reflects on Paul's experiences in Philippi, where despite trials and contradictions, the sovereignty of God was evident, and joy was found in focusing on Christ rather than personal interests. The message encourages believers to seek a deeper relationship with Christ through the work of the Cross, leading to a life of joy and freedom from self. Ultimately, the sermon calls for a crucified life that embraces the supply of the Spirit of Jesus Christ.