The way I read Romans, I see Justification as “being declared righteous in the sight of God,” which is done at once, based on Faith Alone (Sola Fide)
This, as opposed to a separate notion of “Sanctification,” which is a lifelong process by which we are actually made to be “righteous”
This seems to alleviate the sticky problem of Ephesians 2:8, which indicates salvation by grace. In fact, the structure of the sentence in Greek indicates Paul is actually shouting “ITS GRACE YOU FOOLS, NOT WHAT YOU DO”
Yet, this contrasted with his command to “continue to work out your salvation with fear and trembling” in Phillipians 2:12 which indicates a process of salvation.
The definition of the Greek Word for salvation (Soteria, used in Phil 2:12) is:
Future salvation, the sum of benefits and blessings which the Christians, redeemed from all earthly ills, will enjoy after the visible return of Christ from heaven in the consummated and eternal kingdom of God.
Fourfold salvation: saved from the penalty, power, presence and most importantly the pleasure of sin.
As opposed to the greek word “Sozo” used in Eph. 2:8 defined as:
“to preserve one who is in danger of destruction, to save or rescue”
Or, as I understand it, the definition of “saved” by faith in Eph. 2:8 is an “incomplete” salvation, i.e. you are now heaven bound, but in Phil 2:12 seems to be a more all-inclusive salvation, which would include a spiritual maturing.
The conclusion that I’ve drawn from these is Sola Fide for the Evangelical use of the word “salvation” i.e. you are now heaven-bound, but that our deeds are part of a conforming to the image of Christ, and maturing in Faith.