It is incorrect to say that physical substances are not spiritual. Physical substances are indeed a key part in God’s will. Genesis chapters 1 and 2 gave an account of God’s creation of this physical world. “And God saw that it was good” again and again. When the Lord came to this world, the Word became flesh. He appeared in the flesh. After His resurrection, He has a glorious resurrected body. In the future, we will also have a resurrected body. Those who dwell in the new heavens and new earth will also have a physical body. They can multiply and fill the earth. We know the value of physical substances, and we also place importance on our spirits. Moreover, we will go to New Jerusalem which is a real physical city!