This book diagnoses an unexamined cause of the incivility in our public discourse. Our most contentious controversies today are moral. We disagree not only about questions of efficiency and democracy and civil liberties but also about what is right to do and who we are becoming as a people. We have not yet understood the implications of this shift in public reasoning from discourse about political ideals to debates about moral imperatives. The book prescribes a way to educate ourselves and our young people how to disagree well. We are not able to engage in moral discourse effectively because our educational programs are still organized around obsolete principles of political neutrality. Meanwhile, our young people have learned to bend moral claims in service to self-authorship. Also, different groups of us look to different sources of moral truth. Further complicating our efforts, different generations use the same language to refer to different moral ideas. The book suggests principles for a practical education that is robustly moral, that will enable us to understand and overcome these new challenges. And it lays out a framework for flourishing together in society despite our radical differences.