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.

Costly grace is the treasure hidden in the field; for the sake of it a man will gladly go and sell all that he has. It is the pearl of great price to buy, for which the merchant will sell all his goods. It is the kingly rule of Christ, for whose sake a man will pluck out the eye which causes him to stumble. It is the call of Jesus Christ at which the disciple leaves his nets and follows him.

from The Cost of Discipleship

—————————
Gender-inclusive version:

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.

Costly grace is the treasure hidden in the field; for the sake of it a person will gladly go and sell all that he or she has. It is the pearl of great price to buy, for which the merchant will sell all his or her goods. It is the kingly rule of Christ, for whose sake a person will pluck out the eye which causes him or her to stumble. It is the call of Jesus Christ at which the disciple leaves his or her nets and follows him.

from The Cost of Discipleship