Book excerpt: If the economic Trinity is the immanent Trinity , as Karl Rahner said, then what difference does it make for how we read the Bible? This book takes up the discussion that has dominated the last several decades of Trinitarian theology - that of Rahner's Rule - and brings it into dialogue with the longer history of the doctrine, particularly with the history of interpretation of scripture. The history of Trinitarianism is the history of complex interpretive moves, a long conversation in which the Christian church has sought to learn how to ask the right questions of scripture. Surveying recent theological projects and learning from their successes and failures, The Image of the Immanent Trinity argues that the eternally perfect fellowship of Father, Son, and Spirit is truly present for our salvation in Christ who, as the image of the invisible God, secures God's presence in the economy of salvation as the image of the immanent Trinity.