The serious Christian, set down for the first time in a Christian community, is likely to bring with him a very definite idea of what Christian life together should be and to try to realize it. But God’s grace speedily shatters such dreams. Just as surely as God desires to lead us to a knowledge of genuine Christian fellowship, so surely must we be overwhelmed by a great disillusionment with others, with Christians in general, and, if we are fortunate, with ourselves. By sheer grace, God will not permit us to live even for a brief period in a dream world. Only that fellowship which faces such disillusionment, with all its unhappy and ugly aspects, begins to be what it should be in God’s sight; begins to grasp in faith the promise that is given to it. The sooner this shock o disillusionment comes to an individual and to a community the better for both. This hour of disillusionment, difficult as it is, is in the end incomparably profitable, because it so throughtly teaches us that we can never live together by our own words and deeds, but only by that one Word and Deed which really binds us together – the forgiveness of sins in Jesus Christ. Christian brotherhood is not an ideal which we must realize; it is rather a reality created by God in Christ in which we may participate.
Dietrich Bonhoeffer, Life Together