The author of Travels with Epicurus and co-author of Plato and a Platypus Walk into a Bar..., jokester and philosopher Daniel Klein filled one of his college notebooks with short quotes from the world's greatest thinkers, hoping to find some guidance on how to live the best life he could. Now looking back from his eighth decade, Klein revisits the wisdom he relished in his youth with this collection of philosophical gems, adding new ones that strike a chord with him near the end of life. From Epicurus to Ralph Waldo Emerson, from Albert Camus to Reinhold Niebuhr—whose words provide the title of this book—each pithy extract is annotated with Klein's singular charm and insight, leaving us chuckling and enlightened.