The Reformation, in spite of its substantial contribution to the history of doctrine and the shock it delivered to theology and the church in the sixteenth century, was not an attack upon the whole of medieval theology or upon Christian tradition. The Reformation assaulted a limited spectrum of doctrinal and practical abuses with the intention of reaffirming the values of the historical church catholic. Thus, the mainstream Reformers reconstructed the doctrines of justification and the sacraments and then modified their ideas of the ordo salutis and of the church accordingly; but they did not alter the doctrines of God, creation, providence, and Christ, and they maintained the Augustinian tradition concerning predestination, human nature and sin. The reform of individual doctrines, like justification and the sacraments, occurred within the bounds of a traditional, orthodox, and catholic system which, on the grand scale, remained substantively unaltered.

Richard A. Muller, Post-Reformation Reformed Dogmatics: The Rise and Development of Reformed Orthodoxy; Volume 1: Prolegomena to Theology, 2nd ed. (Grand Rapids, MI: Baker Academic, 2003), 97.