In a world congenial to skepticism, skeptics love to play the skeptic’s card nonchalantly as if it were the royal flush that trumped all other cards and could not be countered. For many, it has become the skeptics’ way of hanging out a “Do Not Disturb” sign. Simply raise a skeptical objection and retire from all argument. ― Os Guinness  (from, Fool’s Talk: Recovering the Art of Christian Persuasion)