The Holy Spirit has become an object of greater attention in Trinitarian theology, and indeed in the broader life of the Church, since the rise of Pentecostalism at the beginning of the twentieth century. Different understandings of the Holy Spirit have had different impacts on worship; here, Elizabeth Welch examines four surprising overlaps in the thought of two radically different traditions of the church about the relationship between the Holy Spirit and worship. These traditions are represented by John Owen, from seventeenth-century England, and John Zizioulas, from contemporary Greece. Welch explores in turn the common themes of the personal and relational nature of the triune God, the immediacy of the encounter with God through the Holy Spirit in worship, the role of the Holy Spirit in leading people into truth, and the transformative nature of worship that draws people into sharing God''s purpose for the world. In each, the insights of Owen and Zizioulas shed new light on the ongoing debate in the Church today.