The four-position foundation means a foundation where a subject and an object have united and multiplied, centering on God. Human beings who are created as children of God based upon His purpose of creation, and who are supposed to follow His ideal of "subject and object," should grow up within the sphere of God's love and fulfill the ideal of creation God originally intended.
However, Satan became the dominator of this world. So, the ideal world can be built when the world under Satan's dominion is restored and completely brought under the dominion of God.
God, through His providence of restoration, has been looking for human beings to build heaven on Earth. When the people on Earth come back to God's bosom, the eternal kingdom of heaven in the spirit world, centering on God, will be built.