Christianity means community through Jesus Christ and in Jesus Christ. No Christian community is more or less than this…What does this mean? It means, first, that a Christian needs others because of Jesus Christ. It means, second, that a Christian comes to others only through Jesus Christ.
The Christian is the man who no longer seeks his salvation, his deliverance, his justification in himself, but in Jesus Christ alone. He knows that God’s Word in Jesus Christ pronounces his guilty, even when he does not feel his guilt, and God’s Word in Jesus Christ pronounces him not guilty and righteous, even when he does not feel that he is righteous at all. The Christian no longer lives of himself, by his own claims and his own justification, but by God’s claims and God’s justification. He lives wholly by God’s Word pronounced upon him, whether that Word declares him guilty or innocent.
But God has put his Word into the mouth of men in order that it may be communicated to other men. When one person is struck by the Word, he speaks it to others. God has willed that we should seek and find His living Word in the witness of a brother, in the mouth of a man. Therefore, the Christian needs another Christian who speaks God’s Word to him. He needs him again and again when he becomes uncertain and discouraged, for by himself he cannot help himself without belying the truth. He needs his brother man as a bearer and proclaimer of the divine word of salvation. He needs his brother solely because of Jesus Christ. The Christ in his own heart is weaker than the Christ in the word of his brother; his own heart is uncertain, his brother’s is sure.
– Dietrich Bonhoeffer, Life Together