r Life offers a groundbreaking treatment of the Puritans' teaching on most major Reformed doctrines, particularly those doctrines in which the Puritans made significant contributions.

The book addresses Puritan teachings on all six loci of theology, covering fifty areas of doctrine. The book explores Puritan teachings on biblical interpretation, God, predestination, providence, angels, sin, the covenants, the gospel, Christ, preparation for conversion, regeneration, coming to Christ, justification, adoption, church government, the Sabbath, preaching, baptism, heaven, hell, and many other topics. It ends with eight chapters that explore Puritan "theology in practice."

Some chapters highlight the work of a specific theologian such as William Perkins, William Ames, John Owen, Stephen Charnock, or Thomas Goodwin on a specific topic. Other chapters survey various authors on a particular subject. The goal of A Puritan Theology is to increase knowledge in the mind and godliness in the soul. It was written for theologians, historians, pastors, and educated laymen who seek to learn more about Puritan theology.