"What was revolutionary about the Protestant Reformers was their insistence that God is not savingly known through created nature as paganism had proposed, or through human nature as the medieval mystics had thought (and some evangelicals now think), or through the Church and its sacraments as the Roman Catholic Church taught, but directly, by the work of the Holy Spirit and the truth of the biblical Word, the internal and supernatural work of the Spirit creating the spiritual climate in which Scripture might be received.
The Reformers rejected all assertions that there are channels of saving grace in nature, human nature, or the Church. They held that there are no intermediaries between God and the sinner save for Christ himself, and they insisted that this unique role could not be usurped without destroying the faith that claimed his name.
Christ's role is a sine qua non, they argued, because the judgment of God on the one side and human corruption on the other have produced a double alienation with which he alone can deal. Only through Christ is God's wrath turned aside and human disaffection from God and his rule replaced by a submissive affection."
David F. Wells | No Place For Truth