Hardcover. Condition: Good. 2 volumes in one. Thick folio. Contemporary vellum. Covers soiled. Good, solid binding. All edges red. Title in red and black. Faint, old damp stain to edge. Folding table. Matthias Flacius Illyricus (Matthias Flach) was a noted Lutheran theologian. Flacius' legacy can be seen in the survival of Lutheranism as a distinct, uncompromising theology. (Which was of course not a fait accompli, Luther had died in 1546.) It was the intellectual strength and emphasis on truth and scripture of 2nd generation Protestants, such as Flacius, that held together Luther's reforms in the face of Catholic opposition. During his life, his strong views and writings concerning the importance of the scripture, church freedom and reassertion of Lutheran criticisms of Roman Catholicism had an outsized influence on the views and success of the German reformation. These writings provided the spiritual and theological guidance that prevented Protestant accommodation with Catholic forces. His work, Clavis scripturae sacrae (A Key to the Sacred Scripture, of the Language of the Sacred Writings) was first published in 1567. Much of his work dealt with how we know the truth and come upon it. For Flacius, the scripture was the source of truth and the path to Christ. For ref: "How to Understand the Sacred Scriptures from Clavis Scripturae Sacrae," Wade Johnston, Magdeburg press, 2011. BM 9: 388 (20) Also, Stanko Jambrek. Flacius' Struggle for the Freedom of the Church, Kairos: Evangelical Journal of Theology, 2012.