In this book Dr David Peterson challenges the common assumption that the New Testament views sanctification as primarily a process. He argues that its emphasis falls upon sanctification as a definitive event, 'God's way of taking possession of us in Christ, setting us apart to belong to him and to fulfil his purpose for us'. Simply to identify sanctification with growth in holiness, he contends, obscures the emphasis and balance of New Testament teaching and creates unrealistic expectations.

Throughout Dr Peterson builds his case on the careful exegesis of relevant passages, with a keen eye for the pastoral implications of his findings.