A great book called: "Cost of Discipleship" by deitrich bonhoffer speaks of grace in an unusual and provoking manner, here are a few quotes:

Cheap grace is the deadly enemy of our Church. We are fighting today for costly grace.
Cheap grace means grace as a doctrine, a principle, a system. It means forgiveness of sins proclaimed as a general truth, the love of God taught as the Christian "conception" of God. 45

Cheap grace means the justification of sin without the justification of the sinner. Grace alone does everything they say, and so everything can remain as it was before. "All for sin could not atone." Well, then, let the Christian live like the rest of the world, let him model himself on the world’s standards in every sphere of life, and not presumptuously aspire to live a different life under grace from his old life under sin. That was the heresy of the enthusiasts, the Anabaptists and their kind…. 46

_________________
SI Moderator - Greg Gordon