Catholics look to salvation as a “process” by which works (other than Christ’s on the cross) must be added, and therefore salvation is completed only at the end of one’s life here on earth.
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Salvation: The forgiveness of sins and restoration of friendship with God, which can be done by God alone.” (Catechism of the Catholic Church, glossary)
Is salvation a one-time event, or a process?
Heb 11:8 tells us that Abraham had “faith” in Gen 12. "
By faith Abraham obeyed when he was called to go out to a place…not knowing where he was to go. " (Heb 11:8; cf. Gen 12:1-4; Acts 7:2-4)
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Since we are “
justified by faith” (Rom 5:1), it follows then that Abraham was therefore
justified by faith in Gen 12.
Furthermore,
Gen 15:6 tells us that Abraham was justified by God because he believed God. “
Abram believed God, and it was reputed to him unto justice.” (Gen 15:6) So, having already been justified by faith in Gen 12, Abraham was further justified in Gen 15.
Furthermore, St. James tells us that Abraham was justified in Gen 22, “by works.” “
Abraham our father justified by works when he offered up Isaac…” (James 2:21; cf. Gen 22:9-18).
It follows that by works, those who are just may be justified further. In fact, Rev. 22:11 says precisely that, “
he that is just (Gk “dikaios”), let him be justified still (Gk "dikaioo*** eti”)***" (Rev 22:11).
Therefore, justification–and by necessity salvation–is not a one-time event but a process which takes place over one’s entire lifetime and involves both faith and works, like it was with Abraham as shown above.
So Catholicism does indeed teach, along with Scripture, that those who are just can be “justified still.”