At the Finkenwalde Seminary, Director Dietrich Bonhoeffer required each student to meditate for half an hour each morning after breakfast. But, “most of the ordinands had trouble getting used to this practice. Wolf-Dieter Zimmermann wrote…”

Half an hour of concentration: it is amazing what comes into your head during that time. the mind moves around, memories arise, dreams awaken. Suddenly anger flares up. When we told Bonhoeffer of this, he said that was all right, things have to come into the open, but they must also be tamed and through prayer.

(Ferdinand Schlingensiepen, Dietrich Bonhoeffer 1906-1945: Martyr, Thinker, Man of Resistance, 181).