The Welsh minister Martyn Lloyd-Jones (1899-1981) was one of the most influential preachers of the twentieth century. His preaching was grounded in his view on the baptism of the Holy Spirit, but his pneumatology is often seen as a departure from his Reformed heritage. In , Dongjin Park explores how Lloyd-Jones's preaching was kindled by his distinctly Reformed view of Spirit baptism. By tracing Lloyd-Jones's writings and sources, Park shows how Lloyd-Jones's theology of Spirit baptism was less an embrace of charismatic and Pentecostal theology than a reappropriation of Puritan emphasis on experiential faith. Lloyd-Jones's revivalistic urgency, fueled by the Spirit's power to ignite preaching and holy living, found its spark in Calvinistic revivalism. sheds light on Lloyd-Jones and Reformed theology and encourages readers to follow his example of relying on the Spirit.