God has seen fit to reveal Himself to man in two books—the Bible, the book of special revelation, and nature and history, the book of general revelation. Now it is the duty of the organized Church to teach men the content of the former of these books, while it is the special task of the school to open the latter. To be sure, the two may not be separated. Truth can hardly be dealt with so mechanically. After all, truth is one because God is one. Truth is organic. And only he who has learned to understand the Bible can really know history and nature. Yet the distinction is a valid one. The Church can hardly be expected to teach the intricacies of mathematics, physics, astronomy, or the history of the Balkans. Nor does any one demand of the school that it preach the gospel. But Church and school together must declare the whole of God’s revealed truth.
R. B. Kuiper, “The Christian School a Necessary Witness in the Modern World,” in The Christian School A Witness of Faith: Supplement – Christian School Statistics, 1935-1936. Chicago, IL: National Union of Christian Schools, November 1935, pp. 7-23.