We end our Ryan Holiday series with his first book of an exciting new series on the virtues of ancient philosophy explores the most foundational virtue of all: Courage.

In Courage Is Calling (buy on Amazon), Ryan Holiday breaks down the elements of fear, an expression of cowardice, the elements of courage, an expression of bravery, and lastly, the elements of heroism, an expression of valor. Through engaging stories about historic and contemporary leaders, including Charles De Gaulle, Florence Nightingale, and Dr. Martin Luther King Jr, Holiday shows you how to conquer fear and practice courage in your daily life.

In a world in which fear runs rampant—when people would rather stand on the sidelines than speak out against injustice, go along with convention than bet on themselves, and turn a blind eye to the realities of modern life—we need courage more than ever.