Sách nói: Quit Your Worrying!

"People will worry, they do worry. What they want to know and need to learn is how to quit worrying. This I have attempted herein to show, with the full knowledge, however, that no one person's recipe can infallibly be used by any other person—so that, in reality, all I have tried to do is to set forth the means I have followed to teach myself the delightful lesson of serenity, of freedom from worry, and thereby to suggest to receptive minds a way by which they may possibly attain the same desirable end." - Summary by George Wharton James