T. Austin-Sparks emphasizes that God's primary purpose during this dispensation, from Christ's ascension to His return, is to extract a spiritual people from the world rather than to improve it. He explains that this extraction begins with the new birth, leading to a progressive spiritual journey away from worldly ties. The remaining believers serve three purposes: representing God's rights on earth, learning the true nature of God, and being a testimony to the world. Sparks highlights that believers are called to live as citizens of heaven while still on earth, embodying the truth of Christ through the Holy Spirit. Ultimately, the focus should be on spiritual intelligence and understanding God's mind, as this is what will endure beyond the temporal world.