Which practices did Dietrich Bonhoeffer introduce at the Finkenwalde seminary?

At the Finkenwalde seminary, which Dietrich Bonhoeffer organized and led for the Confessing Church starting in 1935, he introduced a rigorous and communal approach to spiritual life. These practices, which he later detailed in his book Gemeinsames Leben (1939; Life Together), primarily included:

• Prayer: A structured commitment to communal and individual prayer.
• Private Confession: The practice of confessing sins to one another as a means of spiritual accountability and grace.
• Common Discipline: A shared rule of life designed to foster spiritual formation and community among the seminarians.1

These practices were intended to cultivate a deeper, more disciplined Christian life, standing in contrast to what Bonhoeffer identified as the ethical laxity and cheap grace prevalent in some Lutheran churches at the time.1