"So oft it chances in particular men
That for some vicious mole of nature in them,
As in their birth—wherein they are not guilty,
Since nature cannot choose his origin—
By the o'ergrowth of some complexion,
Oft breaking down the pales and forts of reason,
Or by some habit that too much o'erleavens
The form of plausive manners, that these men,
Carrying, I say, the stamp of one defect,
Being nature's livery, or fortune's star,
Their virtues else—be they as pure as grace,
As infinite as man may undergo—
Shall in the general censure take corruption
From that particular fault. The dram of evil
Doth all the noble substance of a doubt
To his own scandal."

Riccardo II - W. Shakespeare