Antakolouthia - Virtual entailment
“There is always an optimal value,” explained the philosopher Gregory Bateson, “beyond which anything is toxic, no matter what: oxygen, sleep, psychotherapy, philosophy.”
The same is true of personality traits. The Stoic philosophers referred to this paradox as “antakolouthia,” or the mutual entailment of the virtues. By this view, no virtue is a virtue by itself. They all include an opposite quality, and overusing a specific strength turns it into a liability.
Confidence untempered by humility, for example, turns into arrogance. Courage without prudence becomes recklessness. Tenacity unmediated by flexibility congeals into rigidity. Honesty in the absence of compassion is cruelty.
http://blogs.hbr.org/schwartz/2010/11/redefining-greatness-its-compl.html
