Augustine of Hippo

Touching this title there is no question. "O Lord who shall sojourn in Your tabernacle?" [Psalm 15:1]. Although tabernacle be sometimes used even for an everlasting habitation: yet when tabernacle is taken in its proper meaning, it is a thing of war. Hence soldiers are called tent-fellows, as having their tents together. This sense is assisted by the words, "Who shall sojourn?" For we war with the devil for a time, and then we need a tabernacle wherein we may refresh ourselves. …

Exposition on Psalm 15 ↗

Jerome

The fourteenth psalm has been read at just the right moment; and it has come about in due order in such a way that it almost seems to have been read on purpose. The psalm was read in order: I think it has been brought about by God's dispensation that what was profitable to you should be recited today in the sequence of exposition. The fourteenth psalm has been read, which is titled A Psalm of David. But our David is Christ, as we have often said. Then we read in Exodus that on the fourteenth day the lamb is sacrificed. …

Homily 5, on Psalm 14 ↗

Thomas Aquinas

Above, the Psalmist treated of the malice and deceit of his adversaries; here he treats of his own justice. And first he shows what kind of justice God accepts. Second, as though giving thanks, he shows the nature of his own justice, at "preserve me." The title: "a Psalm of David." In this Psalm he does two things: for, standing before God as a priest, he consults God. First, the question is set forth. …

Exposition on the Psalms of David ↗