important influence upon Karl Rahner, who gave the laudatio for Przywara in 1967, and especially upon Hans Urs von Balthasar, who regarded him as an "unforgettable guide and master." Indeed, he considered the "breadth and profundity of his thought" to be "without comparison in our time." He was at the same time an esteemed teacher of the Catholic philosopher Josef Pieper and a friend and mentor to the now canonized philosopher Edith Stein. While Przywara's reception in modern Catholic theology was generally positive, and his importance to Hans Urs von Balthasar enduring, his doctrine of the analogy of being was fiercely challenged by Karl Barth, who saw in it a kind of natural theology and therefore rejected it, calling it the "invention of Antichrist" and the "chief reason for not becoming Catholic." This issue continues to define the ecumenical debate between Reformed and Catholic Christians. Professor Graham Macaleer has written that Pope Benedict XVI's Regensburg Address is a commentary on the book Analogia Entis, and that "no single work by a Catholic in the 20th century rivals Analogia Entis in scope or insight." Pope Francis quoted his book Idee Europa during his acceptance speech for the Charlemagne Prize. Pope John Paul II commended Przywara as one of the great theologians of the Catholic tradition, in such company as Albert the Great. References Selected major works Eucharistie und Arbeit (1917) Einführung in Newmans Wesen und Werk (1922) Religionsbegründung. Max Scheler—J.H. Newman (1923) Gottgeheimnis der Welt (1923) Gott (1926) Religionsphilosophie katholischer Theologie (1926; translated into English as Polarity, 1935) Ringen der Gegenwart, 2 vols. (1929) Analogia entis: Metaphysik (1932) Augustinus. Die Gestalt als Gefüge (1934) Deus semper maior. Theologie der Exerzitien, 3 vols. (1938) Crucis mysterium. Das christliche Heute (1939) Humanitas. Der Mensch gestern und morgen (1952) Christentum gemäß Johannes (1954) In und Gegen. Stellungnahmen zur Zeit (1955) Alter und Neuer Bund. Theologie der Stunde (1956) Logos, Abendland, Reich, Commercium (1964) Bibliography Hans Urs von Balthasar, “Analogie und Dialektik. Zur Klärung der Prinzipienlehre Karl Barths.” In Divus Thomas 22 (1944), 171-216. Hans Urs von Balthasar, “Analogie und Natur. Zur Klärung der theologischen Prinzipienlehre Karl Barths.” In Divus Thomas 23 (1945), 3-56. Hans Urs von Balthasar, “Die Metaphysik Erich Przywaras.” In Schweizerische Rundschau 33 (1933/34), 489-499. Hans Urs von Balthasar, “Erich Przywara.” In Erich Przywara. Sein Schrifttum 1912-1962, ed. Leo Zimny. Einsiedeln: Johannes Verlag, 1963, 5-18. Siegfried Behn, ed, Der beständige Aufbruch. Festschrift