Grace has to be the total paradigm, mix it with anything else and it can’t exist.
From Paul Zahl.
How can grace end-run its way around standards and yardsticks? It sounds unfair.
It is unfair, but it is completely unfair. It is the other side of the law, which is total grappling, a totally unsuccessful and failed grappling, with judgment. Because the law is completely fair, grace has to be completely “unfair.” The atonement makes grace “fair,” as is apparent in the teaching concerning the cross, But from our point of view, from the standpoint of its recipient, grace is unfair.
The unfair character of grace makes it persona non grata in the cut-and-thrust of the battle of life. Nobody welcomes grace. At the same time everybody pants for it; everybody wants it every second of every hour. Grace is an either-or proposition; it is not both-and.
Grace In Practice, Paul F. M. Zahl, Eerdmans, 2007, pgs 70-71.