Though it is often remarked that Hodge’s theological method is more rationalistic than many Reformed theologians would like it to be, Hodge often drives us back to the only true foundation for all theology—something upon which we should all agree:
It has been assumed that Theology has to do with the facts or truths of the Bible; in other words, that the Scriptures of the Old and New Testaments are the only infallible rule of faith and practice. This, however, is not a conceded point. Some claim for Reason a paramount, or, at least a coordinate authority in matters of religion. Others assume an internal supernatural light to which they attribute paramount, or coordinate authority. Others rely on the authority of an infallible church. With Protestants, the Bible is the only infallible source of knowledge of divine things. (Charles Hodge, Systematic Theology, 1:33)