A Firm Foundation: An Aid to Interpreting the Heidelberg Catechism

In the introduction, Caspar Olevianus noted that he wrote A Firm Foundation to “Christians experiencing a variety of afflictions and trials” as an “explanation of the Articles of the Christian Faith.” Originally published as an independent treatise, A Firm Foundation provides an interpretive tool on parallel portions of the Heidelberg Catechism, covering the Lord’s Days 5 through 24 in the catechism.