Bonhoeffer on cheap grace:
Cheap grace is the deadly enemy of our Church. We are fighting today for costly grace. Cheap grace means grace sold on the market like cheap-jacks’ wares. The sacraments, the forgiveness of sin, and the consolations of religion are thrown away at cut prices… Cheap grace is the preaching of forgiveness without requiring repentance, baptism without church discipline, Communion without confession, absolution without personal confession. Cheap grace is grace without discipleship, grace without the cross, grace without Jesus Christ, living and incarnate [Quoted in David F. Wells, Above All Earthly Pow’rs: Christ in a Postmodern World (Grand Rapids: Eerdmans, 2005), 263].
