It don't make no difference whether you do right or wrong, a person's conscience ain't got no sense, and just goes for him anyway.If I had a yaller dog that didn't know nomorethana person's conscience does Iwould poison him. It takes up more room than all the rest of a person's insides, and yet ain't no good, nohow. Tom Sawyer he says the same.

-Twain, Mark pseudonym of  Samuel Langhorne Clemens
  TheAdventures of Huckleberry Finn, ch.33.