T. Austin-Sparks emphasizes the dual nature of Jesus Christ as both inclusive and exclusive in God's plan, highlighting that all things are summed up in Him. He explains that while Christ encompasses all that is necessary for divine purpose, only what is of Christ is ultimately accepted by God. The Church, as the corporate body of believers, is called to reflect Christ as the Heavenly Man, transcending earthly distinctions and embodying a new creation in Him. Sparks urges believers to recognize their heavenly identity and to strive for a life that is fully aligned with Christ, as only that which is of Him will endure in the end. The sermon calls for humility and dependence on Christ, acknowledging that true effectiveness comes from being filled with Him.