No one can possibly know what is about to happen: it is happening, each time, for the first time, for the only time.
Remaining vigilant toward this ever-present threat means constantly learning how better to protect ourselves. But primarily it reminds us that we must fight and win the war on terror, so that we do not have to fight it here in America.
I suppose that the scope and implications of such forces have rendered my personal accounting ritual pretty much obsolete. That's how things sometimes go.