The Reformed tradition today often carries a reputation for narrowness and dogmatism, rather than breadth and diversity. But it was not always so. In the early modern era, the Reformed family of churches boasted not merely a host of theological luminaries of the highest rank, but a remarkable diversity of viewpoints on church polity, ethics, sacraments, and even matters like atonement theology. At their best, they charitably debated these differences within a shared confessional framework, offering examples for Protestants today of how to pursue the maxim, “in essentials unity, in non-essentials liberty, in all things charity.” The essays in this volume offer an introduction to the theological rigor and surprising breadth of the early Reformed tradition.