If you’ve read Green Baggins for a while you may remember posts dealing with the FV issues of faithfulness. Wanted to draw your attention to a good summary of this issue Wes White has posted at his blog, Sola Fide or Sola Fidelity?
Wes has provided a very helpful and focused post on a critical FV problem with this issue. Is faith = faithfulness? Does the FV make faith = faithfulness? How those questions are answered make all the difference in the world.
If Wes is right in his observations (I tend to think he is) then the FV does commit a fatal error. It introduces into justification what is exclusive to sanctification. In doing so it ends up with a confused doctrine of justification, one which is synergistic not monergistic.