With tongue in cheek, Mark Twain spoke of the two-faced life we all live: I am constructed like everybody else and enjoy a compliment as well as any other fool, but I do like to have the other side presented. And there is another side. I have a wicked side. Estimable friends who know all about it would tell you and take a certain delight in telling you things that I have done and things further that I have not repented. The real life that I live, and the real life that I suppose all of you live, is a life of interior sin. That is what makes life valuable and pleasant. To lead a life of undiscovered sin! That is true joy.

Mark Twain in a speech to the Society of American Authors, November 15, 1900