In his latest book, Terry Eagleton, one of the most celebrated intellects of our time, considers the least regarded of the virtues. His compelling meditation on hope begins with a firm rejection of the role of optimism in life's course. Like its close relative, pessimism, it is more a system of rationalization than a reliable lens on reality, reflecting the cast of one's temperament in place of true discernment. Eagleton turns then to hope, probing...