Friedrich Nietzsche was right—sort of.

The German philosopher's oft-quoted adage, "What does not destroy me, makes me stronger," was put to the test as part of a national study of the effects of adverse life events on mental health by researchers at the University at Buffalo-the State University of New York and the University of California, Irvine.

The study, published in the latest issue of the Journal of Personality and Social Psychology, found that people who had experienced a few adverse events in their lives reported better mental health and well being than people with a history of frequent adversity and people with no history of misfortune....

An article in 'The Wall Street Journal'