11 “Direct in Your sight my way.” Nothing is clearer, than that he here sets forth that time, in which he is journeying onward. For this is a way which is traversed not in any regions of the earth, but in the affections of the heart. “In Your sight,” he says, “direct my way:” that is, where no man sees; who are not to be trusted in their praise or blame. For they can in no wise judge of another man's conscience, wherein the way toward God is traversed. Hence it is added, “for truth is not in their mouth”. To whose judgment of course then there is no trusting, and therefore must we fly within to conscience, and the sight of God. “Their heart is vain.” How then can truth be in their mouth, whose heart is deceived by sin, and the punishment of sin? Whence men are called back by that voice, “Wherefore do ye love vanity, and seek a lie?”
12. “Their throat is an open sepulchre.” It may be referred to signify gluttony, for the sake of which men very often lie by flattery. And admirably has he said, “an open sepulchre:” for this gluttony is ever gaping with open mouth, not as sepulchres, which, on the reception of corpses, are closed up. This also may be understood hereby, that with lying and blind flattery men draw to themselves those whom they entice to sin; and as it were devour them, when they turn them to their own way of living. And when this happens to them, since by sin they die, those by whom they are led along, are rightly called open sepulchres: for themselves too are in a manner lifeless, being destitute of the life of truth; and they take in to themselves dead men, whom having slain by lying words and a vain heart, they turn unto themselves. “With their own tongues they dealt craftily:” that is, with evil tongues. For this seems to be signified, when he says “their own.” For the evil have evil tongues, that is, they speak evil, when they speak craftily. To whom the Lord says, “How can you, being evil, speak good things?”
13. “Judge them, O God: let them fall from their own thoughts”. It is a prophecy, not a curse. For he does not wish that it should come to pass; but he perceives what will come to pass. For this happens to them, not because he appears to have wished for it, but because they are such as to deserve that it should happen. For so also what he says afterwards, “Let all that hope in You rejoice,” he says by way of prophecy; since he perceives that they will rejoice. Likewise is it said prophetically, “Stir up Your strength, and come:” for he saw that He would come. Although the words, “Let them fall from their own thoughts,” may be taken thus also, that it may rather be believed to be a wish for their good by the Psalmist, while they fall from their evil thoughts, that is, that they may no more think evil. But what follows, “drive them out,” forbids this interpretation. For it can in no way be taken in a favourable sense, that one is driven out by God. Wherefore it is understood to be said prophetically, and not of ill will; when this is said, which must necessarily happen to such as chose to persevere in those sins, which have been mentioned. “Let them,” therefore, “fall from their own thoughts,” is, let them fall by their self-accusing thoughts, “their own conscience also bearing witness,” as the Apostle says, “and their thoughts accusing or excusing, in the revelation of the just judgment of God.”
14. “According to the multitude of their ungodlinesses drive them out:” that is, drive them out far away. For this is “according to the multitude of their ungodlinesses,” that they should be driven out far away. The ungodly then are driven out from that inheritance, which is possessed by knowing and seeing God: as diseased eyes are driven out from the shining of the light, when what is gladness to others is pain to them. Therefore these shall not stand in the morning, and see. And that expression is as great a punishment, as that which is said, “But for me it is good to cleave to the Lord,” is a great reward. To this punishment is opposed, “Enter into the joy of Your Lord;” for similar to this expulsion is, “Cast him into outer darkness.”
15. “Since they have embittered You, O Lord: I am,” says He, “the Bread which came down from heaven;” again, “Labour for the meat which wasts not;” again, “Taste and see that the Lord is sweet.” But to sinners the bread of truth is bitter. Whence they hate the mouth of him that speaks the truth. These then have embittered God, who by sin have fallen into such a state of sickliness, that the food of truth, in which healthy souls delight, as if it were bitter as gall, they cannot bear.
16. “And let all rejoice that hope in You;” those of course to whose taste the Lord is sweet. “They will exult for evermore, and You will dwell in them”. This will be the exultation for evermore, when the just become the Temple of God, and He, their Indweller, will be their joy. “And all that love Your name shall glory in You:” as when what they love is present for them to enjoy. And well is it said, “in You,” as if in possession of the inheritance, of which the title of the Psalm speaks: when they too are His inheritance, which is intimated by, “You will dwell in them.” From which good they are kept back, whom God, according to the multitude of their ungodlinesses, drives out.
17. “For You will bless the just man”. 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. “For all have sinned, and want the glory of God.” “For whom He called, them He also justified; and whom He justified, them He also glorified.” Since then calling is not of our merit, but of the goodness and mercy of God, he went on to say, “O Lord, as with the shield of Your good will You have crowned us.” For God's good will goes before our good will, to call sinners to repentance. And these are the arms whereby the enemy is overcome, against whom it is said, “Who will bring accusation against God's elect?” Again, “if God be for us, who can be against us? Who spared not His Only Son, but delivered Him up for us all.” “For if, when we were enemies, Christ died for us; much more being reconciled shall we be saved from wrath through Him.” This is that unconquerable shield, whereby the enemy is driven back, when he suggests despair of our salvation through the multitude of tribulations and temptations.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)