Purpose of Scripture: Prepare for (OT) and Report On (NT) the Missions of the Son and Spirit

We will be arguing throughout this book that the Trinity is a biblical doctrine. But it is not enough to say that the mystery of the Trinity is in the Bible unless we recognize that the thing we are calling the Bible is a set of texts that were written, redacted, and canonized to prepare for and report on the missions of the Son and the Spirit. To somebody about to come through the texts to find the elements of the doctrine, we have to say: the Trinity is in the Bible because the Bible is in the Trinity (Fred Sanders, The Triune God, 44).