Because God has already laid the only foundation of our fellowship, because God has bound us together in one body with other Christians in Jesus Christ, long before we entered into common life with them, we enter into that common life not as demanders but as thankful recipients. We thank God for what he has done for us. We thank God for giving us brethren who live by His call, by His forgiveness, and His promise. We do not complain of what God does not give us; we rather thank God for what He does give us daily. And is not what has been given us enough: brothers, who will go on living with us through sin and need under the blessing of His grace? Is the divine gift of Christian fellowship anything less than this, any day, even the most difficult and distressing day? Even when sin and misunderstanding burden the communal life, is not the sinning brother still a brother, with whom I, too, stand under the Word of Christ? Will not his sin be a constant occasion for me to give thanks that both of us may live in the forgiving love of God in Jesus Christ? Thus the very hour of disillusionment with my brother becomes incomparably salutary, because it so thoroughly teaches me that neither of us can ever live 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. When the morning mists of dreams vanish, then dawns the bright day of Christian fellowship.
From pages 28-29
I highly recommend this book.