Abstract
Thomas Pröpper’s (1941–2015) systematic theology, that was deemed particularly innovative especially in the German-speaking Catholic realm but thus far has garnered hardly any international attention, poses the question of whether a reflection of the is and ought of freedom yields any returns for the question of God and moreover for ethics. 1 A theological way of thinking should be established that helps with understanding faith whilst also offering philosophical justification. 2 For eminently theological reasons, Pröpper pursues a theology of freedom because God’s self-revelation as love can be adequately inferred through concepts of freedom. 3 Pröpper’s theological approach of a question of the contemporary philosophy of subject and freedom also involves the inclusion of authority-critical thought. 4 According to Pröpper’s own information, Hermann Krings’s freedom thinking in particular alongside his transcendental philosophy, 5 tracing back to Immanuel Kant and Johann Gottlieb Fichte, is applicable to Pröpper’s own approach. 6 Consequently, for Pröpper a theological argument can be given only from man (ex parte hominis). For such an argument to be convincing, it must fulfil satisfy two criteria: it must be able to exist in the application of one’s own reason (“im Gebrauch der eigenen Vernunft”) and in the execution of freedom (“im Vollzug der Freiheit”). 7
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