God's purpose is to fill this earth with His glory.
Numbers 14:21
But as truly as I live, all the earth shall be filled with the glory of the LORD.
Isaiah 11:9
They shall not hurt nor destroy in all my holy mountain: for the earth shall be full of the knowledge of the LORD, as the waters cover the sea.
Habakkuk 2:14
For the earth shall be filled with the knowledge of the glory of the LORD, as the waters cover the sea.