When a war breaks out, people say: “It’s too stupid; it can’t last long.” But though a war may well be “too stupid,” that doesn’t prevent its lasting. Stupidity has a knack of getting its way; as we should see if we were not always so much wrapped up in ourselves. In this respect our townsfolk were like everybody else, wrapped up in themselves; in other words they were humanists: they disbelieved in pestilences. A pestilence isn’t a thing made to man’s measure; therefore we tell ourselves that pestilence is a mere bogy of the mind, a bad dream that will pass away. But it doesn’t always pass away and, from one bad dream to another, it is men who pass away, and the humanists first of all, because they haven’t taken their precautions. Our townsfolk were not more to blame than others; they forgot to be modest, that was all, and thought that everything still was possible for them; which presupposed that pestilences were impossible. They went on doing business, arranged for journeys, and formed views. How should they have given a thought to anything like plague, which rules out any future, cancels journeys, silences the exchange of views. They fancied themselves free, and no one will ever be free so long as there are pestilences.
-- Albert Camus, The Plague