Will future justification depend on our works? That depends in part on how one defines the term
justification and what one means by
depend on our works. Works will not function as the
ground or
basis of a right standing or acceptance with the holy God of perfect rectitude who demands utter essential righteousness. The blood and righteousness of the risen Jesus alone provide that all-sufficiently. But works will be
necessary to be declared just on the Last Day, the day of reckoning and reward or punishment. One text in particular makes this crystal clear: Rom. 2:13.
I know that good commentators and Gospel lovers think that Paul is speaking hypothetically (the same sort of thing is often said of the warning passages in Hebrews). But such does not consider evenhandedly Paul's plain language and the flow of thought. Without spending time on the exegesis here, I'll simply commend what I think the text is saying. Romans 1 indicts the Gentiles, those without the law. Romans 2 turns toward indicting the Jews, the "keepers" of the law. And Rom. 2:12-16 functions as part of that indictment, showing that some Gentiles will be justified
apart from the law. That is, those Gentiles who are doers of the law, having "the work of the law written on their hearts" (Rom. 2:15; cf. Jer. 31:33; Ezek. 36:26-27)
—they will be justified.
To understand what is being asserted here, let me say what is not being said. Romans 2 is emphatically
not saying that the deeds of these doers of the law function as the
basis or
ground of this future justification in view. Future justification, in the sense of being declared righteous justly before a holy and righteous God, depends wholly on Jesus' blood and righteousness (Rom. 1:17; 3:21-26; 4:1-8; 5:18-19; 10:4). But what
is being asserted is that only those who are doers of the law, who are fulfilling it (Rom. 13:8-10)
—they alone will be declared righteous (and will be declared so for Jesus' sake), but not
because they are doers of the law, and certainly not because they are mere possessors of the law.
Yet this doing of the law (doing deeds of love flowing from vital union with Jesus in the Spirit of love), since it necessarily flows from the faith that does justif
y—this doing is necessary (it has to be there or there is no saving faith), and it authenticates the justified. Good deeds therefore are necessary for salvation, but not at all as the ground or basis of God's giving the gift of salvation. That gift is free, received
by faith alone apart from works of the law, purchased at infinite cost by Christ's atonement, offered freely to the sinner in Jesus' blood and righteousness. And this receiving of the gift through faith alone will be the way the justified sinner enters heavenly reward at the judgment as well
—receiving God's free acceptance and "well done" in Christ as total gift. No ground for boasting! None! Whatever!
Consequently, there will be no one on the day of judgment who will be justified who has not in some measure been a doer of the law. For only those who truly believe, and are justified by faith alone, do what the law calls for, namely, reborn deeds of love in conscious dependence on the grace of Jesus alone. So the doers of the law, and the doers alone (not those who merely possess it)
—they will be justified. And in Romans 2 this functions as a polemic against those Jews who thought that mere possession of the Torah guaranteed a right standing in covenant with God.