My husband built a barrier wall in the back yard and the cornerstone was off so he had to start over this is how important is the cornerstone. The cornerstone according to Wikipedia is the most important stone to a building.
Jesus is our cornerstone.
The Living Stone
you also, as living stones, are being built up as a spiritual house for a holy priesthood, to offer up spiritual sacrifices acceptable to God through Jesus Christ. For this is contained in Scripture: “BEHOLD, I LAY IN ZION A CHOICE STONE, A PRECIOUS CORNER stone, AND HE WHO BELIEVES IN HIM WILL NOT BE DISAPPOINTED.”This precious value, then, is for you who believe; but for those who disbelieve, “THE STONE WHICH THE BUILDERS REJECTED, THIS BECAME THE VERY CORNER stone,” I Peter 2: 5-7