To Bonhoeffer, Christianity was not the concern of the believing, pious soul who shuts himself up and keeps himself within the bounds of the sacramental sphere. No, according to him Christianity has its place in this world and the Church as the Body of Christ, and the fellowship in him can only be the visible Church. Man must follow him who has served and passed through the world as the living, the dying and the risen Lord. Therefore, wherever it pleases God to put man in this world, the Christian must be ready for martyrdom and death. It is only in this way that man learns faith.

Memoir by G. Leibholz in  Dietrich BonhoefferThe Cost of Discipleship1961 edition, 24.

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