Great summary statement by Sanders about his view of Paul’s soteriology in Paul and Palestinian Judaism:

Pressed by opponents on on various sides, he [Paul] expounded the significance of the present state of the Christian life in such a way that the simple theology of future expectation and present possession of spiritual gifts was greatly deepened. We could do no better than guess by what chain of reasoning or under what history of religions influence Paul deepened the idea of the possession of the Spirit as a guarantee so that it became participation in on Spirit, or the idea of Christ’s death as cleansing former trespasses so that it became the means by which one participated in Christ’s death to the power of sin, but it is clear that he did so, and that herein lies the heart of his soteriology and Christology. (452-53)