A careful exploration of how the identity and mission of the Holy Spirit have been progressively revealed throughout Holy Scripture and then interpreted by the Church. The Progressive Mystery describes how the Spirit has been revealed, understood, and interpreted throughout the sweep of Holy Scripture and the ways in which the orthodox understanding of the mission of the Holy Spirit has developed. An ideal entrée into the study of pneumatology, it introduces readers to the complex history of the theology of the Holy Spirit. Ideal for students, it takes its place among other introductions to pneumatology, as a readable and reliable guide to an elusive topic.