All worshipping, honoring or service invented by the brain of man in the religion of God, without his own express commandment, is idolatry. The mass is invented by the brain of man without any commandment of God: Therefore it is idolatry.
—John Knox, Works, 3.34 (spelling modernized. HT: Sung Yeo).
R. Scott Clark
R.Scott Clark is the President of the Heidelberg Reformation Association, the author and editor of, and contributor to several books and the author of many articles. He is professor emeritus of church history and historical theology at Westminster Seminary California, where he taught for 29 years. He also taught at Wheaton College, Reformed Theological Seminary, and Concordia University. He has hosted the Heidelblog since 2007 and the Heidelcast since 2009.
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