In his New York Times bestselling book Courage is Calling, author Ryan Holiday made the Stoic case for a bold and brave life. In this much-anticipated second book of his Stoic Virtue series, Holiday celebrates the awesome power of self-discipline and those who have seized it.To master anything, one must first master themselves–one’s emotions, one’s thoughts, one’s actions. Eisenhower famously said that freedom is really the opportunity to practice self-discipline. Cicero call