Thomas Aquinas, on Ps 42:1

“A psalm for David. Judge me, O God, and distinguish my cause from the nation that is not holy: deliver me from the unjust and deceitful man.”

“In the preceding Psalm, David narrated his desire; now he applies prayer to fulfill that desire. And first he sets forth the prayer; second, its effect, at "why are you sorrowful?" Concerning the first he does two things. First he proposes the prayer in general; second, in particular, at "from the unjust man." And first he asks for judgment; second, the effect of the judgment. He asks therefore, "judge me, O God." But this seems to be presumptuous, because he himself says, "enter not into judgment," etc. Ps. 142. I respond. It must be said that there is a twofold judgment: namely, of severity and of mercy or equity. The first is when only the matter is attended to and not the condition of the person; and this is to be feared. Of this he says, Ps. 142: "Enter not into judgment," etc., because our acts of justice are nothing in the sight of God, as is said in Is. 64. And this judgment is without mercy, as is said in Jas. 2. The second is when not only the nature of the matter is considered, but the condition of the person. Ps. 102: "The Lord has had mercy on those who fear Him, for He knows our frame." And this is what he asks for. Or, alternatively, there is a twofold judgment: namely, of examination, when merits are scrutinized -- and this he does not ask for here, because the examination is to be feared. Job 9: "I feared all my works, knowing that you would not spare the offender." The other is of discrimination, namely, separation from the wicked; and this is what he asks for. And so he adds, "and distinguish my cause." And this refers to the present state: and thus we ask to be distinguished from the wicked, if not in place, at least in cause. For many things are common to us and to them, because place is a matter of fortune's lot, but cause is not -- because good and bad use the same circumstances differently, for in adversities the good shine through patience, while the wicked fume with impatience. But if we refer it to the future judgment, we ask to be distinguished, because the cause of the wicked shall be judged unto condemnation, and that of the good unto salvation. In particular, he asks to be judged with regard to two things: namely, with regard to deliverance from evil, and with regard to advancement in good. He asks therefore to be delivered from evil, whether present or future; hence he says, "from the unjust and deceitful man, rescue me." The "unjust man" is a name for the Devil. Mt. 13: "An enemy, a man, has done this." Or any other seducing man, or any unjust person. And he is called unjust because he openly intends injustice; deceitful, on account of hidden fraud. Prov. 12: "Deceit is in the heart of those who plot evil." From these, therefore, one is delivered in two ways. In one way, so as not to be seduced by hidden deceitfulness. In another way, so as not to be crushed by adversity.”

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