The known God

the object of evangelical theology is God in the history of his deeds. In this history he makes himself known. But in it he also is who he is. In it he has and proves, in a unity which precludes the precedence of one over the other, both his existence and his essence. The God of the Gospel, therefore, is neither a thing, an item, an object like others, nor an idea, a principle, a truth, or a sum of truths. ....The sum of the truths about God is to be found in a sequence of events, even in all the events of his being glorious in his work. 

Karl Barth, Evangelical Theology: an Introduction,
page 9.

It is wonderful to listen to a live recording of Barth giving this lecture.