The Reformation of the Image

With his 95 Theses, Martin Luther advanced the radical notion that all Christians could enjoy a direct, personal relationship with God—shattering years of Catholic tradition and obviating the need for intermediaries like priests and saints between the individual believer and God. The text of the Bible, the Word of God itself, Luther argued, revealed the only true path to salvation—not priestly ritual and saintly iconography.

But if words—not iconic images—showed the way to salvation, why d...