costly grace.

(from The Cost of Discipleship by Dietrich Bonhoeffer)

"Such grace is costly because it calls us to follow, and it is grace because it calls us to follow Jesus Christ.  It is costly because it costs a man his life, and it is grace because it give a man the only true life.  It is costly because it condemns sin, and grace because it justifies the sinner.  Above all, it is costly because it cost God the life of his Son: 'ye were bought at a price,' and what has cost God much cannot be cheap for us.  Above all, it is grace because God did not reckon his Son too dear a price to pay for our life, but delivered him up for us."