Prologue : one long argument -- I. The origins of morality -- Transcendent morality : how evolution ennobles ethics -- Why we are moral : the evolutionary origins of morality -- Why we are immoral : war, violence, and the ignoble savage within -- Master of my fate : making moral choices in a determined universe -- II. A science of provisional ethics -- Can we be good without God? : science, religion, and morality -- How we are moral : absolute, relative, and provisional ethics -- How we are immoral : right and wrong and how to tell the difference -- Rise above : tolerance, freedom, and the prospects for humanity -- Appendix I. The devil under form of baboon : the evolution of evolutionary ethics -- Appendix II. Moral and religious universals as a subset of human universals.