The normal is often irrelevant

"I don’t particularly care about the usual . If you want to get an idea of a friend’s temperament , ethics, and personal elegance, you need to look at him under the tests of severe circumstances, not under the regular rosy glow of daily life. Can you assess the danger a criminal poses by examining only what he does on an ordinary day? Can we understand health without considering wild diseases and epidemics? Indeed the normal is often irrelevant ."