William Strong (ca. 1611–1654) was an influential leader at the Westminster Assembly and was greatly admired by his contemporaries. In modern times, however, even those most indebted to the Westminster tradition are unfamiliar with this stalwart of the seventeenth century. In this book, Thomas Parr opens by introducing us to the significance of the life and ministry of Strong and then launches into a survey and summary of Strong's teaching on the covenant of works. Along the way, this book shows that the condemnation from a covenant of works serves as a dark backdrop to display the glory of the covenant of grace.