“The point of the resurrection…is that the present bodily life is not valueless just because it will die…What you do with your body in the present matters because God has a great future in store for it…What you do in the present—by painting, preaching, singing, sewing, praying, teaching, building hospitals, digging wells, campaigning for justice, writing poems, caring for the needy, loving your neighbor as yourself—will last into God's future. These activities are not simply ways of making the present life a little less beastly, a little more bearable, until the day when we leave it behind altogether. They are part of what we may call building for God's kingdom.”
What is a person? The Jewish understanding of a person is the person is created both physical and spiritual. This is contrasted with the Greek understanding (dualism) that a person is fully spiritual and this physical world is a cage that the spiritual needs to be released from (Plato’s philosophy). God created the world perfectly physical and spiritual and called it good.
The prophetic imagination of Isaiah envisions a new world where there is no longer a need for swords or spears (1:4) and where predator and prey will live in harmony together. This prophetic imagination is looking forward to the coming of Christ, the Son of David, who will put the world back to right again under His reign.