The body of Greek literature generated prior to, and concurrent with the writing of the New Testament, plainly demonstrates that "justification" (from the Greek "dikiao") is a forensic decree by which a person or object is declared to be "all right" or "o.k." in the estimation of the declarant. There is no lexical evidence whatsoever to suggest that justification is a process by which a person or object it gradually transformed to conform to the will of another.
Therefore, when Scripture speaks of men being justified before God through faith in Jesus Christ (Romans 3:20, 24-25, 28), this does not refer to a process by which God transforms men to holiness or godliness over time. Rather, it is a divine decree whereby men, though still sinful and subject to all manner of wickedness, are declared "not guilty" and wholly acceptable in the sight of God (Romans 5:8).
The intrinsic meaning of justification as a forensic decree (rather than a dynamic process) can be demonstrated by the use of various forms of the term "dikiao" (justify) within Scripture, even apart from extra-biblical literature (Luke 18:14; Acts 13:39).
The sole basis of justification before God is the blood of Jesus Christ, and that the sole requirement for justification before God is faith in Jesus Christ (Romans 3:24-25; 5:1, 9). Progressive conformation to the will of God through obedience to His laws has never been, and will never be the basis of justification before God (Romans 3:28; 4:2).