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But Bonhoeffer had a much more Lutheran / Anglican understanding of the sacraments (see Discipleship) than Barth.
I also think Bonhoeffer's reading of the Sermon on the Mount has odd aspects.
Bonhoeffer tried to bring back confession as a practice, and Barth had no interest in that as clerical religiosity and intimacy.
Barth was an Swiss, rural, country, pastor's son, pastoring among the mine and factory workers, with a chip on his shoulder, lobbing bombs.