Notre-Dame is a sign of the times
Notre-Dame is the symbolic heart of Paris and France, and a symbol of European Christianity second only to the Vatican in Rome. The apocalyptic destruction of a monument of such beauty and significance would be a sign of the times at any time. In our time, however, no one seems sure of what the sign means. I doubt I was alone in my first response. When I saw footage of the falling, burning spire, I assumed that this was an act of terrorism rather than, as seems most likely, an accident caused by renovation work. This is a sign of the times, even though it would be incautious to admit it in polite society.