“So it is more useful to watch a man in times of peril, and in adversity to discern what kind of man he is; for then at last words of truth are drawn from the depths of his heart, and the mask is torn off, reality remains.” — Lucretius

Anybody can be good when times are good.  You see what someone is made of in the bad times.  How do they act?  How do they deal with the trouble, pain, hurt and adversity.  When the going gets tough, the tough get going as they say.  People are most honest when they are at their end and all the layers of the onion are pealed away.