Scripture teaches that those who are justified have peace with God and will be glorified (Rom. 5:1; 8:30). This means, among other things, that God continually forgives the sins of those he justified and that once they are justified, they cannot fall from the state of justification (see WCF 11.5). What does this mean for Christians on the last day, the day of judgment? Here’s how Francis Turretin nicely explained it:
Although our justification will be fully declared on the last day (our good works also being brought forward as the sign and proof of its truth, Mt. 25:34-40), still falsely would anyone maintain from this a twofold gospel justification – one from faith in this life (which is the first); the other (and second) from works on the day of judgment (as some hold, agreeing too much with the Romanists on this point).
The sentence to be pronounced by the supreme Judge will not be so much a new justification, as the solemn and public declaration of a sentence once passed and its execution by the assignment of the life promised with respect to an innocent person from the preceding justification. Thus it is nothing else than an adjudicatory sentence of the possession of the kingdom of heaven from the right given before through justification. And if works are then brought forward, they are not adduced as the foundation of a new justification to be obtained then, but as signs, marks and effects of our true faith and of our justification solely by it.
Covenant Presbyterian Church (OPC)
Hammond, WI, 54015