Virtue itself turns vice, being misapplied,
And vice sometime by action dignified.
Within the infant rind of this weak flower
Poison hath residence and medicine power:
For this, being smelt, with that part cheers each
part; Being tasted, stays all senses with the heart.
Two such opposèd kings encamp them still
In man as well as herbs—grace and rude will;
And where the worser is predominant,
Full soon the canker death eats up that plant.
-- William Shakespeare, Romeo and Juliet, Act 2, Scene 3
