Can it be rational to be religious? Robert Audi gives a persuasive positive answer through an account of rationality and a rich, nuanced understanding of what religious commitment means. It is not just a matter of belief, but of emotions and attitudes such as faith and hope, of one's outlook on the world, and of commitment to live in certain ways. Audi's qualified acceptance of the possibility of secular human flourishing is most welcome, as some Christian apologists have suggested the denial of this.