One might say that it is an absurd idea that future sins, which are not yet committed, would be forgiven. But this idea contains nothing absurd if one only considers that for the Judge who pronounces forgiveness, the record of sins, their guilt, does not lie hidden in the darkness of the future but in the full light of His divine omniscience. Furthermore, it cannot be more absurd to forgive sins in advance than to atone for sins in advance. The latter has taken place in Christ. He bore millions of sins that were not yet perpetrated and for which the perpetrators were not yet in existence. This is possible because for God’s eternal view all that, too, was present.
As there has been no small debate in recent decades over the doctrine of justification, I was delighted to come across a treatment of the once-for-all nature of justification in Geerhardus Vos’ Reformed Dogmatics. Having introduced the subject by explaining that the Roman Catholic church conflates justification and sanctification with it’s doctrine of a first and second justification, Vos explained that even within the Reformed tradition there have been those who have denied that justification was a once-for-all, non-repeatable act. Some within the Reformed tradition, he acknowledged, “think that justification repeatedly follows each confession of sin.” With these aberrant views in the background of his treatment, Vos went on to defend the majority Reformed view that “justification is an actus individuus et simul totus, that is, an indivisible act that occurs only once” by setting out six (typically brilliant) reasons why we must hold this view. Vos’ reasons for the belief that justification is non-repeatable are as follows:
“1. Scripture itself nowhere says that the judicial act of God, which it calls justification, would be capable of repetition. Rather, it always presents justification as occurring at one point in time. As there is one predestination, one calling, one glorification, so there is also only one justification, and this stands between the other acts of the order of salvation (Rom 8:30), of which it is certain and generally agreed that they occur but once.
2. The idea of sonship implies that we cannot lose the state of justification once we have obtained it. A son can certainly sin and transgress against his father, but he does not therefore cease to be a son. By adoption as children, the legal position of believers in relation to God is loosed once for all from their own doing and working. Note: not their moral position but their legal position. A believer remains under the moral law, and for him every transgression of it is sin, which must be confessed. But his status before God is no longer determined by those things.
3. If justification must be constantly repeated, then it is not clear how a sinner could ever come to be in a state of being justified. In each fraction of a second a new sin is committed; there is never a sinless moment in the life of believers.”