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a forensic term, opposed to condemnation
As regards its nature, it is the judicial act of God, by which he pardons all the sins of those who believe in Christ, and accounts, accepts, and treats them as righteous in the eye of the law, i.e., as conformed to all its demands.
In addition to the pardon of sin, justification declares that all the claims of the law are satisfied in respect of the justified. It is the act of a judge and not of a sovereign. The law is not relaxed or set aside, but is declared to be fulfilled in the strictest sense; and so the person justified is declared to be entitled to all the advantages and rewards arising from perfect obedience to the law (Romans 5:1-10).
Justification is not the forgiveness of a man without righteousness, but a declaration that he possesses a righteousness which perfectly and for ever satisfies the law, namely, Christ's righteousness (2 Corinthians 5:21; Romans 4:6-8).
The sole condition on which this righteousness is imputed or credited to the believer is faith in or on the Lord Jesus Christ. Faith is called a “condition,” not because it possesses any merit, but only because it is the instrument, the only instrument by which the soul appropriates or apprehends Christ and his righteousness (Romans 1:17; 3:25-26; 4:20, 22; Philippians 3:8-11; Galatians 2:16).