Augustine of Hippo

"For You will bless the just man" [Psalm 5:12]. This is blessing, to glory in God, and to be inhabited by God. Such sanctification is given to the just. But that they may be justified, a calling goes before: which is not of merit, but of the grace of God. …

Exposition on Psalm 5 ↗

Jerome

Lord, Thou hast crowned us as with a shield of good will. In the world one thing is the shield, another the crown; but with God He Himself is the shield, He Himself is also the crown. As a shield He protects, as God He crowns: He Himself is our shield, He Himself is also our crown. And this is what he says, Lord, Thou hast crowned us as with a shield of Thy good will: Thou hast protected us with Thy shield, and Thy protection was our crown, that is, our crown was Thy shield, it was our victory. For the crown is interpreted as victory.

Homily 2, on Psalm 5 ↗

Thomas Aquinas

Next, when he says "For," he shows why they hope. First, because of the gift of grace. Second, from the mercy of predestination, etc. From the gift of grace, hence he says, "For you have blessed the just," namely by giving him a special grace: Eph. 1: "He blessed us with every spiritual blessing in the heavenly places." And the mercy of predestination: Eph. …

Exposition on the Psalms of David ↗