From Chapter Nine, Why "Applying It to Your Life" Is Boring: Or, How the Gospel Is Beautiful.
You may have heard the saying that the preaching of the gospel is like one beggar telling another beggar where to get bread. I don't think that's quite right. If the only preaching we heard was advice about where to get bread, then we'd be in trouble: we're weak and starving beggars, and we might not have the strength to follow the instructions we're given all the way to the bread. We could die along the way. But thank God, the preaching of the gospel is more merciful and more powerful than that. It's not one beggar giving advice to another beggar about where to get bread; it's one beggar giving another beggar the bread of life. It's like a pastor giving us Christ's words, "This is my body, given for you," and then putting a piece of bread right in our hands. That is the divine authority given to a preacher of the gospel: you're a beggar giving other beggars nothing less than Christ, the bread of life.