Michael Welker provides an excellent, systematic look at the mentions of the Spirit in the Hebrew and Christian Bible and their implications for communities today. Welker rejects abstract and mystical “inexplicable” understandings of the Holy Spirit and provides an overview of the varied, complicated, and yet detailed and real pictures of the Spirit working both in the world of Scripture and in our world today. Welker works within what he describes as “realistic theology,” “a theology that is related to various structural patterns of experience and that cultivates a sensitivity to the differences of those various patterns.” Welker’s realistic theology displays intriguing similarities to the philosophical work of Gilles Deleuze and Felix Guattari, insisting on a complex and ever-changing understanding of the Spirit – and that complexity and change are characteristics of the Spirit itself. Nonetheless, Welker insists, not any old change will do. Spirit-led change is characterized by the intersection of the knowledge of God, justice and mercy – and you can’t have any one of the three without the other two. A community infused by the Spirit of God will display love, a “free self-withdrawal and self-giving for the benefit of other creatures.” Welker backs up his theological assertions with the full range of Scriptural investigations from Samson up to the Pauline church. A dense read, well-written but definitely technical; excellent for professional theologians and possibility upper-level graduate seminars. At the bottom, if the church would take seriously Welker’s (biblical) notion of the Spirit that infuses a community with love to make a difference in the here in now, a lot more people would be both spiritual and religious.