and are justified by his grace as a gift, through the redemption that is in Christ Jesus,
24. Being justified freely, etc. A participle is here put for a verb according to the usage of the Greek language. The meaning is, — that since there remains nothing for men, as to themselves, but to perish, being smitten by the just judgment of God, they are to be justified freely through his mercy; for Christ comes to the aid of this misery, and...
From all this Paul infers that it is in vain to look for justification by the works of the law, and that it is to be had only by faith, which is the point he has been all along proving, from Rom 1:17, and which he lays down (Rom 3:28) as the summary of his discourse, with a quod erat demonstrandum - which was to be demonstrated.
Commenting on Romans 3:19-31
Therefore we conclude,.... This is the conclusion from the premises, the sum total of the whole account: that a man is justified by faith without the deeds of the law. The subject of justification is, "man", not in opposition to angels; nor does it design the Jew against the Gentile, though some have so thought; but the apostle names neither Jew nor Gentile, but "man"...