Moreover, recent research had shown that while wars did have their psychological victims, they were far fewer than, say, the victims of stress, tedium, congenital illness, loneliness, and rejection.

When a community had a major problem to face—for example, war, hyperinflation, or plague— there was a slight increase in the number of suicides but a marked decline in cases of depression,
paranoia, and psychosis.

These returned to their normal levels as soon as that problem had been overcome, indicating, or so Dr. Igor thought, that people only allow themselves the luxury of being insane when they are in a position to do so.

- Paulo Coelho
Veronika Decides to Die