The words justification and sanctification have largely fallen out of use in Western culture. Sadly, they are also fading from sight in the Christian church. One reason this decline is distressing is that the Bible uses the words justification and sanctification to express the saving work of Christ for sinners. That is to say, both terms lie at the heart of the biblical gospel. So, what does the Bible teach about justification and sanctification? How do they differ from one another? How do they help us understand better the believer’s relationship with Jesus Christ?