God has willed that we should seek and find God’s living Word in the testimony of other Christians, in the mouths of human beings. Therefore, Christians need other Christians who speak God’s Word to them. They need them again and again when they become uncertain and disheartened because, living by their own resources, they cannot help themselves without cheating themselves out of the truth. They need other Christians as bearers and proclaimers of the divine word of salvation. They need them solely for the sake of Jesus Christ. The Christ in one’s own heart is weaker than the Christ in the word of another Christian. The heart in one’s heart is uncertain; the Word is sure. At the same time, this also clarifies that the goal of all Christian community is to encounter one another as bringers of the message of salvation.
from Life Together (Fortress, 2015), 6.