I believe the Bible is the word of God from cover to cover.

In this declaration, Billy Sunday—an early 20th‑century American evangelist known for his populist, revivalist preaching—affirms a doctrine of biblical inerrancy or total authority: the Bible is God’s word in its entirety (“from cover to cover”), not merely in selected passages. The phrasing functions rhetorically as a boundary marker against modernist or higher‑critical approaches that treated parts of Scripture as historically conditioned or fallible. It also signals a plain‑sense, comprehensive trust in Scripture as the ultimate guide for belief and conduct, consistent with Sunday’s broader emphasis on conversion, moral reform, and uncompromising certainty in religious proclamation.