Thomas Aquinas, on Ps 13:2

“The Lord hath looked down from heaven upon the children of men, to see if there be any that understand and seek God.”

“"The Lord." Here, first, he certifies the fault. Second, he expounds it, at "Their throat." Sin is certified through iniquity; and therefore here he sets forth God's investigation, saying: you say that there is no God; but this is false, because "the Lord has looked down from heaven upon the children of men": Prov. 16: "All the ways of man are open to his eyes." He looked down, therefore, by sending his Son -- the Lord the Father from heaven, that is, from the bosom of his loving-kindness: Is. 66: "Heaven is my throne." Or "from heaven," that is, Christ, through whom he will judge sinners. Or alternatively: some say that God does not know singulars and changeable things, because he is immaterial and simple and eternal. And so he does not know according to the movements of things, and according to the mode of his knowability. The response is: on the contrary, because he knows material things immaterially, as Dionysius concludes. And so also the intellect knows: and therefore he says "from heaven," that is, from the height of his dignity and nature. "He looked down upon the children of men." And he wishes to find in us -- by his antecedent will, by which he wills all to be saved -- that which pertains to salvation, namely that we may know God through the intellect and love him through the affections and desire him. And therefore he says, "that he may see," that is, "that he may make us see," because he himself always sees. "Whether there is one who understands," through the intellect: Deut. 32: "Would that they were wise and understood," etc. "Or seeks God," through the affections.”

Imported from an open dataset — not yet checked against the printed edition.