Brad Smith walks through Hebrews 10:11-17 to show why Christ's single, perfect sacrifice accomplished what thousands of years of Old Testament priestly offerings never could — both expiation (removing our sin) and propitiation (giving us Christ's righteousness). Because of this "great exchange" described in 2 Corinthians 5:21, believers are positionally holy before God once and for all. Yet that justification is not the finish line; it launches us into the hard, Spirit-empowered work of sanctification, where God is actively conforming us to the image of His Son.