In this comprehensive polemical treatise, French Protestant Reformer and theologian, Franciscus Junius, masterfully responds to the many falsities of Rationalius, who dubs himself a rational catholic. First, Junius lays the foundation: sacred axioms on nature and grace. Second, he sums up the status of the controversy on nature and grace. Third and perhaps most importantly—composing most of the book—he systematically cites 119 arguments of Rationalius and confutes them all. Fourth and finally, he offers his conclusion and gives a warning to the Reader. A polemical tour de force, packed with profit. "Regarding our own mind, we will only say this: we are so concerned with charity and edification in truth and holiness that we have the God who is the author of our callings as the most certain witness of our faith in our consciences... Let us therefore come to the doctrines. If we observe them carefully, they can be summarized into two main points: the first concerns Nature, and the second, the Grace of God towards us." —Franciscus Junius