To conclude my part of this discussion, here are some quotes from John Calvin in the Institutes, book four, chapters five and six. Some quick notes: if this is getting old, I'm sorry and I'm almost done. If this discussion feels off-balanced by not addressing the preacher's responsibility, I agree and hope to write more about that soon. Finally, these quotes from Calvin are meant to inform the idea and are not aimed at anyone in particular.
On Ephesians 4:10-13: We see how God, who could in a moment perfect his own, nevertheless desires them to grow up into manhood solely under the education of the church. We see the way set for it: the preaching of the heavenly doctrine has been enjoined upon the pastors. We see that all are brought under the same regulation, that with a gentle and teachable spirit they may allow themselves to be governed by teachers appointed to this function.
On God's giving interpeters to His people (Mal. 2:7): This is doubly useful. On the one hand, he proves our obedience by a very good test when we hear his ministers speaking just as if he himself spoke. On the other, he also provides for our weakness in that he prefers to address us in human fashion through interpreters in order to draw us to himself, rather than to thunder at us and drive us away.
To those who think the authority of the Word is belittled when handled with authority by men: For, although God's power is not bound to outward means, he has nonetheless bound us to this ordinary manner of teaching. Fanatical men, refusing to hold fast to it, entangle themselves in many deadly snares. Many are led either by pride, dislike, or rivalry to the conviction that they can profit enough from private reading and meditation; hence they despise public assemblies and deem preaching superfluous...In order, then, that pure simplicity of faith may flourish among us, let us not be reluctant to use this exercise of religion which God, by ordaining it, has shown us to be necessary and highly approved.
What follows in chapter six is a great portion discussing the balance of believing the primacy of preaching yet giving full credit to God who "claims for himself alone both the beginnings of faith and its entire course."