Revelation 21: 16: “And the city is laid out as a square … and he measured the city with the rod, fifteen hundred miles; its length and width and height are equal.” Why does the New Jerusalem need a wall that high? That’s five times higher than the edge of the earth’s atmosphere. For sure, you’d have no problems with burglars! Actually, the Lord is showing us here the Trinity (L x W x H all equal) and the fact that there is no property shortage in Heaven. With the city limits that large, there’s plenty of room for everyone!