According to Karl Barth, God can not be grasped by epistemological categories of human beings, because God is the wholly Other. God is done by the sola gratia. For Barth, natural theology which is possible by the analogia entis is impossible because of the radical corruption of human beings. What we need is the analogia fidei in order to acquire a knowledge of God. However, Emil Brunner`s understanding of revelation is different from Barth`s. Brunner admits a fundamental significance of general revelation in his dialectics. It becomes a presupposition of special revelation in the formal aspect of Imago Dei which signifies universal characteristics of human beings which separate them from other creatures. But, Brunner`s acceptance of general revelation is passive. Like Barth, he also admits only the sola gratia. In Barth`s view, Brunner`s thinking is in danger of falling into natural theology, because the formal image slips into the material. We can hold the Reformed principle of the sola gratia admitting an epistemological effect of general revelation, insofar as revelation is grasped within the Trinitarian point of view. The Trinitarian point of view should be accepted in all spheres of theology.