Dietrick Bonhoeffer says in his book "Life Together":
" God has willed that we should seek and find His living Word in the witness of a brother/sister, in the mouth of a man/ woman. Therefore, the Christian needs another Christian who speaks God’s Word to him/her. He/she needs him again and again when he becomes uncertain and discouraged, for by himself he cannot help himself without belying their 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."