"I, with body and soul, both in life and in death, am not my own, but belong to my faithful savior Jesus Christ.” So begins The Heidelberg Catechism. Written by Zacharius Ursinus and published in 1563, the Heidelberg Catechism quickly became a manual for Christian living and religious instruction during the Reformation. A catechism focused on helping Christians lay hold of the deepest truths in the best ways was dearly needed during the tumultuous time of the Reformation.