of God the Holy Spirit. As a result, evangelical Christians have been in reality the most thoroughly Trinitarian Christians in the history of the church. This is a strong claim and one not often heard these days, but I hope to make good on it in the course of this book. The characteristic beliefs, commitments, practices, and presuppositions of evangelicalism were all generated by a spiritual revolution: an applied Trinitarian theology that took more seriously than ever before in Christian history