" very high standard, again, involves the possession of rare virtues, and rare virtues are like rare plants or animals, things that have not been able to hold their own in the world. A virtue to be serviceable must, like gold, be alloyed with some commoner but more durable metal. People divide off vice and virtue as though they were two things, neither of which had with it anything of the other. This is not so. There is no useful virtue which has not some alloy of vice, and hardly any vice, if any, which carries not with it a little dash of virtue; virtue and vice are like life and death, or mind and matter — things which cannot exist without being qualified by their opposite. The most "

― Samuel Butler , Complete Works of Samuel Butler