Ezekiel 42:15-20 says:
15 Now when he had finished measuring the interior of the temple area, he led me out by the gate that faced east, and measured the temple area all around. 16 He measured the east side with the measuring reed, 500 cubits by the measuring reed all around. 17 He measured the north side, 500 cubits by the measuring reed all around. 18 He measured the south side, 500 cubits by the measuring reed. 19 Then he turned to the west side and measured, 500 cubits by the measuring reed. 20 He measured it on the four sides. It had a wall around it, 500 cubits long and 500 cubits broad, to make a separation between the holy and the common.
The temple of God was a square, and as verse 20 says, this was done to distinguish that which is holy from that which is common. In other words, it was to distinguish what was of God and what was of man.
In Revelation 21, John gets a vision like Ezekiel’s, though he sees not a temple, but a city. In verse 16, we discover the measurements of that new city:
The city lies foursquare, its length the same as its width. And he measured the city with his rod, 12,000 stadia. Its length and width and height are equal.
This is the city in which God’s people will dwell forever, the heavenly city, the celestial city, the city of God. There will be no temple in that city. Instead, God will dwell freely in and with with His people forever.
It is no coincidence that both the new city and the old temple are squared. Both are done to symbolize the same thing, what is outside is common and what is inside is holy. But in the city, everyone is holy, for everyone is of God and everyone lives in the city.
That will be a glorious day! God will dwell with man. We will be His people and He our God. There will be no boarder between God and man. There will be nothing to separate us in time or distance or emotion or spirit. We will be one with Him as the Father, Son, and Spirit are One. That day will come for those who trust in Christ now, and I can’t wait to take my place in that great and glorious city!