How might Karl Barth's engagement with the question of the relationship of the church to Judaism during the Nazi era help us today as we seek to revise that relationship? It is obvious that we cannot simply repeat his statements today. But the reference to Barth would be unproductive if it consisted solely in the assertion that the opponent of anti-Semitism at that time was in fact in league with his adversaries. Protestants all too willingly take on an air of self-importance, imagining the distant past to be the proverbial night in which all cats are gray. It would also be insufficient to find in this theologian some good initial ideas, to the extent that they agree with one's own views, in order then, when one differs from his thinking, to identify all the logical flaws that one believes to have been successfully overcome. In neither case would we learn anything, but only confirm our own position. If our encounter with a teacher of the church is to be fruitful, we must enter into a conversation in which we are not only the questioners, but also those who are questioned. True, such a teacher, whom we may critically question, is only an authority subject to the Word of God. But a proper teacher of the church is an authority under the Word of God, and his or her question to us, therefore, is whether we, as we move ahead, are following the Word of God as attested in the Bible or only our own authority.