Augustine of Hippo

"The malicious one has been brought to nought in his sight" [Psalm 15:4]. This is perfection, that the malicious one have no force against a man; and that this be "in his sight;" that is, that he know most surely that the malicious is not, save when the mind turns itself away from the eternal and immutable form of her own Creator to the form of the creature, which was made out of nothing. "But those that fear the Lord, He glorifies:" the Lord Himself, that is. …

Exposition on Psalm 15 ↗

Jerome

In his sight the malignant man is brought to nothing. See what he says. In his sight the malignant man is brought to nothing. Even if he is an emperor, even if he is a prefect, even if he is a bishop, even if he is a presbyter (for in the church these are the dignities), whoever is evil is counted for nothing in the sight of the holy man. And at once there follows, But he glorifies those who fear the Lord. …

Homily 5, on Psalm 14 ↗

Thomas Aquinas

"The malicious one is brought to nothing." Here he shows that one should not be contemptuous. In a man there are two things: vice and virtue. Vice is to be despised; and so he says the malicious person, insofar as he is such, "is brought to nothing," that is, is considered as nothing. And this is good: first, to remove emulation, for sometimes a wicked person is exalted. Jer. 12: "The way of the wicked prospers," etc. But on account of this, one should by no means consider him great, but ought to despise him. 1 Macc. …

Exposition on the Psalms of David ↗