The Dogmatician: We Know God because God knows God.

No knowledge of God is possible except that which proceeds from and by God (Matt. 11:27; 1 Cor. 2:10ff). …His self-knowledge and self-consciousness is the source (principium essendi) of our knowledge of him. Without the divine self-consciousness, there is no knowledge of God in his creatures. Pantheism is the death of theology. The relation of God’s own self-knowledge to our knowledge of God used to be expressed by saying that the former was archetypal of the latter and the latter ectypal of the former. Our knowledge of God is the imprint of the knowledge God has of himself but always on a creaturely level and in a creaturely way. The knowledge of God present in his creatures is only a weak likeness, a finite, limited sketch, of the absolute self-consciousness of God accommodated to the capacities of the human or creaturely consciousness. But however great the distance is, the source (principium essendi) of our knowledge of God is solely God himself, the God who reveals himself freely, self-consciously, and genuinely. —Herman Bavinck, Reformed Dogmatics