There are numerous Summas from the thirteenth century, but none quite like Thomas Aquinas's Summa Theologiae in simplicity, scope, and rigor of organization. The structure of the Summa may seem complex to those approaching it for the first time, but it is a remarkable feat of clarity in comparison with its predecessors. In his spare and accessible English translation, Mark D. Jordan captures this clarity in Thomas's discussion of the theological virtue of faith.