The main wall separating Egypt and Gaza that was partially destroyed by the Palestinians last week is still unrepaired, allowing for free access into and out of Gaza.
Most famously, if one window was broken in a building and left unrepaired (his italics), soon all the other windows would be broken too, and criminal elements would take over.
For the church, built over a cave which marks the traditional birthplace of Jesus Christ, the biggest problem is water damage from unrepaired leaks and the reluctance of the Greek, Armenian and Roman Catholic hierarchs to agree on any repair plan that might disrupt the Ottoman-era system for sharing access to the building.