COURAGE IS CALLING by Ryan HolidayThe instant New York Times, Wall Street Journal,and USA TodayBestseller! Ryan Holiday s bestselling trilogy The Obstacle Is the Way, Ego is the Enemy, and Stillness is the Key captivated professional athletes, CEOs, politicians, and entrepreneurs and helped bring Stoicism to millions of readers. Now, in the first book of an exciting new series on the cardinal virtues of ancient philosophy, Holiday explores the most foundational virtue of all: Courage.