Rev Robert Kolb further explores what seems to be a real mystery, the Righteousness which is granted to us: concerning how it is we can be both sinner and saint simultaneously. He elaborates upon Luther’s explanation (e.g. in the Small Catechism) how God’s assured promise is delivered to us through both the Word and sacraments. It is therefore our responsibility to maintain faithful trust ’in Christ alone’ without doubt, and to apply this to our vocation in life.