Canon 2 of the Fourth Lateran Council (1215) condemned De unitate seu essentia Trinitatis by Joachim of Fiore and established that the unity of Trinity is not «a collective one or one by way of similitude, as many men are called one people and many faithful one Church». Therefore, starting from this condemnation, this article analyzes the notion of analogia entis defined by canon 2 of the Fourth Lateran Council and the reception of this notion in Erich Przywara's theology.