Every man, like every dog, has his own individual limit of endurance. Most men reach their limit after about thirty days of more or less continuous stress under the conditions of modern combat. The more than averagely susceptible succumb in only fifteen days. The more than averagely tough can resist for forty-five or even fifty days. Strong or weak, in the long run all of them break down. All, that is to say, of those who are initially sane. For, ironically enough, the only people who can hold up indefinitely under the stress of modern war are psychotics. Individual insanity is immune to the consequences of collective insanity.

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "Every man, like every dog, has his own individual limit of endurance. Most men reach their limit after about thirty days of more or less continuous stress under the conditions of modern combat. The more than averagely susceptible succumb in only fifteen days. The more than averagely tough can resist for forty-five or even fifty days. Strong or weak, in the long run all of them break down. All, that is to say, of those who are initially sane. For, ironically enough, the only people who can hold up indefinitely under the stress of modern war are psychotics. Individual insanity is immune to the consequences of collective insanity." in the context of "Aldous Huxley, Brave New World Revisited (London: Chatto & Windus, 1959), Chapter 7: "Brainwashing", p. 88 https://archive.org/details/bravenewworldrev0000aldo_p6s5/page/88/mode/2up?q=psychotics" to mean that wisdom is timeless.