Thomas Aquinas, on Ps 9:13

“For requiring their blood he hath remembered the: he hath not forgotten the cry of the poor.”

“"Have mercy." Here he sets forth the fruit as regards himself. And first, he commemorates the benefit. Second, he sets forth the fruit, at "that I may announce," etc. The benefit is twofold: one future, the other already received. "Who exalts," etc. First, he does two things. First, he sets forth the mercy. Second, the motive for mercy. The future benefit is mercy. "Have mercy on me." Ps. 32: "The earth is full of the mercy of the Lord." The motive for mercy is the consideration of God. "See," that is, consider, "my humiliation." This humility does not signify the virtue, as in "if I did not think humbly," but rather abasement. Hence Jerome has "my affliction from my enemies," because they afflict me. Or otherwise: "See my humility," because he gives grace to the humble, Jas. 4. But this can be considered from the consideration of enemies, who are proud and wicked. Consequently, he acknowledges the benefit already received: "Who exalts me," etc.; as if to say: you have rescued me from so great a danger that nothing remained but for me to die. Jer. 9: "Death has come up through our windows; it has entered our houses to destroy the little ones outside." Spiritually, however, the gates of death are the heretics: Mt. 16: "The gates of hell shall not prevail against it." And the senses of man: Jer. 9: "Death has entered through the windows." Hatred of the word of God: Ps. 106: "Their soul abhorred all food, and they drew near even to the gates of death." Temptations and vices: Wis. 16: "You lead to the gates of death, and bring back again." Therefore whoever is freed from these, let him say, "You exalt me," that is, "You have freed me from the gates of death."”

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