Cheap grace vs. costly grace

"Cheap grace is the grace we bestow on ourselves...the preaching of forgiveness without requiring repentance...grace without discipleship, grace without the cross, grace without Jesus Christ, living and incarnate.
Costly grace is the gospel which must be sought again and again, the gift which must be asked for, the door at which a man must knock. Such grace is costly because it calls us to follow Jesus Christ. It is costly because it costs a man his life, and it is grace because it gives a man the only true life."
                                                                                        -Dieterich Bonhoeffer, German priest/martyr