The Christian’s Only Comfort is the sermonic exposition of the Heidelberg Catechism by Theodore VanderGroe (1705–1784), a prominent divine of the Dutch Further Reformation. VanderGroe’s exposition of the Heidelberg Catechism could be considered his magnum opus, and in some ways, it was esteemed as highly by the godly in the Netherlands as The Christian’s Reasonable Service of Wilhelmus à Brakel. In this able exposition of the Heidelberg Catechism, we find the unmistakable characteristics of the Dutch Further Reformation: it is steeped in Scripture; it is very pastoral; and it promotes a robust, comprehensive form of Reformed piety.