In The Cost of Discipleship, Bonhoeffer wrote that the fellowship of Christ's suffering means communion with God even in separation from Him.
According to Bonhoeffer, Luther gave up the protection of the Monastery in order to engage in "hand-to-hand conflict" with the world.
This is a quote from Dietrich Bonhoeffer's The Cost of Discipleship. Do not wait for faith to motivate you. Obedience to Christ will lead you into it.
In The Cost of Discipleship, Dietrich Bonhoeffer argued that the grace of salvation is also the call to discipleship, a call, that is, to take up the cross.