Many thanks for your kind letter. But what an obstinate fellow you are! You write that you were very impressed with what I told you last week in the Theological School. And now you manage to put down on paper all that nonsense about the kingdom of God that we must build. Dear N.N., in so doing you do not contradict merely one ‘insight’ but the whole message of the Bible. If you persist in this idea I can only advise you to take up any other career than that of a pastor.
Karl Barth, from a letter to a theological student in Basel, in Karl Barth: Letters: 1961-1968 (1981), p. 283.