 One of the most painful, self-mutilating, time- and energy-consuming exercises in the human experience is guilt. It can ruin your day or your week or your life if you let it. It turns up like a bad penny when you do something dishonest, hurtful, tacky, selfish, or rotten. What she's saying, if you do something dishonest, hurtful, tacky, selfish, or rotten, don't feel bad about it.