"What then have we more than they? For we have proved both Jews and Gentiles, that they are all under sin. As it is written, There is none righteous, no, not one: there is none that understands, there is none that seeks after God. They are all gone out of the way, they are together become unprofitable; there is none that does good, no not one. Their throat is an open sepulchre; with their tongues have they used deceit; the poison of asps is under their lips; whose mouth is full of cursing and bitterness: their feet are swift to shed blood: destruction and misery are in their ways: and the way of peace have they not known: there is no fear of God before their eyes."
He had accused the Gentiles, he had accused the Jews; it came next in order to mention the righteousness which is by faith. For if the law of nature availed not, and the written Law was of no advantage, but both weighed down those that used them not aright, and made it plain that they were worthy of greater punishment, then after this the salvation which is by grace was necessary. Speak then of it, O Paul, and display it. But as yet he does not venture, as having an eye to the violence of the Jews, and so turns afresh to his accusation of them; and first he brings in as accuser, David speaking of the same things at length, which Isaiah mentioned all in short compass, so furnishing a strong curb for them, so that they might not bound off, nor any of his hearers, while the matters of faith were laid open to them, might after this start away; being beforehand safely held down by the accusations of the prophets. For there are three excesses which the prophet lays down; he says that all of them together did evil, and that they did not do good indifferently with evil, but that they followed after wickedness alone, and followed it also with all earnestness. And next that they should not say, "What then, if these things were said to others?" he goes on:
This may seem to be an infrequent crime. But we take it to include not only those who shed blood by killing the body but also those who by some deception or other separate the soul from God.… For if the one who separates the body from the soul which gives it life is called a murderer, how much more truly will the one who separates the soul from the true life, which is God, be called a murderer?Feet in this passage refers to the way we live our life, as the prophet says: “My feet had almost stumbled.”
[AD 407] John Chrysostom on Romans 3:9-18
He had accused the Gentiles, he had accused the Jews; it came next in order to mention the righteousness which is by faith. For if the law of nature availed not, and the written Law was of no advantage, but both weighed down those that used them not aright, and made it plain that they were worthy of greater punishment, then after this the salvation which is by grace was necessary. Speak then of it, O Paul, and display it. But as yet he does not venture, as having an eye to the violence of the Jews, and so turns afresh to his accusation of them; and first he brings in as accuser, David speaking of the same things at length, which Isaiah mentioned all in short compass, so furnishing a strong curb for them, so that they might not bound off, nor any of his hearers, while the matters of faith were laid open to them, might after this start away; being beforehand safely held down by the accusations of the prophets. For there are three excesses which the prophet lays down; he says that all of them together did evil, and that they did not do good indifferently with evil, but that they followed after wickedness alone, and followed it also with all earnestness. And next that they should not say, "What then, if these things were said to others?" he goes on: