A person may feel deeply without shouting his emotion to the skies, or be strong without seizing occasions to exhibit his strength. In truth we distrust the power which makes too much a display of itself. Let it exert itself only to the point of securing the ends that are really necessary. Restraint, self-control are in truth more mighty than might unshackled, just as a self-possessed opponent is more dangerous than a frenzied one. Moreover, there is a moral side to the question. A good quality, if abused or allowed free sway, becomes a force for evil and does its owner more harm than if he had not possessed it in the first place.

They that have power to hurt, and will do none,
That do not do the thing they most do show,
Who, moving others, are themselves as stone,
Unmoved, cold, and to temptation slow,—

They rightly do inherit heaven's graces,
And husband nature's riches from expense;
They are the lords and owners of their faces,
Others, but stewards of their excellence.

The summer's flower is to the summer sweet,
Though to itself it only live and die;
But if that flower with base infection meet,
The basest weed outbraves his dignity:

For sweetest things turn sourest by their deeds;
Lilies that fester smell far worse than weeds.

William Shakespeare.