7 “You have hated all that work iniquity.” God's hatred may be understood from that form of expression, by which every sinner hates the truth. For it seems that she too hates those, whom she suffers not to abide in her. Now they do not abide, who cannot bear the truth. “You will destroy all that speak a lie.” For this is the opposite to truth. But lest any one should suppose that any substance or nature is opposite to truth, let him understand that “a lie” has relation to that which is not, not to that which is. For if that which is be spoken, truth is spoken: but if that which is not be spoken, it is a lie. Therefore says he, “You will destroy all that speak a lie;” because drawing back from that which is, they turn aside to that which is not. Many lies indeed seem to be for some one's safety or advantage, spoken not in malice, but in kindness: such was that of those midwives in Exodus, who gave a false report to Pharaoh, to the end that the infants of the children of Israel might not be slain. But even these are praised not for the fact, but for the disposition shown; since those who only lie in this way, will attain in time to a freedom from all lying. For in those that are perfect, not even these lies are found. For to these it is said, “Let there be in your mouth, yea, yea; nay, nay; whatsoever is more, is of evil.” Nor is it without reason written in another place, “The mouth that lies slays the soul:” lest any should imagine that the perfect and spiritual man ought to lie for this temporal life, in the death of which no soul is slain, neither his own, nor another's. But since it is one thing to lie, another to conceal the truth (if indeed it be one thing to say what is false, another not to say what is true), if haply one does not wish to give a man up even to this visible death, he should be prepared to conceal what is true, not to say what is false; so that he may neither give him up, nor yet lie, lest he slay his own soul for another's body. But if he cannot yet do this, let him at all events admit only lies of such necessity, that he may attain to be freed even from these, if they alone remain, and receive the strength of the Holy Ghost, whereby he may despise all that must be suffered for the truth's sake. In fine, there are two kinds of lies, in which there is no great fault, and yet they are not without fault, either when we are in jest, or when we lie that we may do good. That first kind, in jest, is for this reason not very hurtful, because there is no deception. For he to whom it is said knows that it is said for the sake of the jest. But the second kind is for this reason the more inoffensive, because it carries with it some kindly intention. And to say truth, that which has no duplicity, cannot even be called a lie. As if, for example, a sword be entrusted to any one, and he promises to return it, when he who entrusted it to him shall demand it: if he chance to require his sword when in a fit of madness, it is clear it must not be returned then, lest he kill either himself or others, until soundness of mind be restored to him. Here then is no duplicity, because he, to whom the sword was entrusted, when he promised that he would return it at the other's demand, did not imagine that he could require it when in a fit of madness. But even the Lord concealed the truth, when He said to the disciples, not yet strong enough, “I have many things to say unto you, but you cannot bear them now:” and the Apostle Paul when he said, “I could not speak unto you as unto spiritual, but as unto carnal.” Whence it is clear that it is not blamable, sometimes not to speak what is true. But to say what is false is not found to have been allowed to the perfect.
8. “The man of blood, and the crafty man, the Lord will abominate.” What he said above, “You have hated all that work iniquity, You will destroy all that speak a lie,” may well seem to be repeated here: so that one may refer “the man of blood” to “the worker of iniquity,” and “the crafty man” to the “lie.” For it is craft, when one thing is done, another pretended. He used an apt word too, when he said, “will abominate.” For the disinherited are usually called abominated. Now this Psalm is, “for her who receives the inheritance;” and she adds the exulting joy of her hope, in saying, “But I, in the multitude of Your mercy, will enter into Your house”. “In the multitude of mercy:” perhaps he means in the multitude of perfected and blessed men, of whom that city shall consist, of which the Church is now in travail, and is bearing few by few. Now that many men regenerated and perfected, are rightly called the multitude of God's mercy, who can deny; when it is most truly said, “What is man that You are mindful of him, or the son of man that You visit him? I will enter into Your house:” as a stone into a building, I suppose, is the meaning. For what else is the house of God than the Temple of God, of which it is said, “for the temple of God is holy, which temple you are”? Of which building He is the cornerstone, whom the Power and Wisdom of God coeternal with the Father assumed.
9. “I will worship at Your holy temple, in Your fear.” “At the temple,” we understand as, “near” the temple. For he does not say, I will worship “in” Your holy temple; but, “I will worship at Your holy temple.” It must be understood too to be spoken not of perfection, but of progress toward perfection: so that the words, “I will enter into Your house,” should signify perfection. But that this may come to a happy issue, “I will” first, he says, “worship at Your holy temple.” And perhaps on this account he added, “in Your fear;” which is a great defence to those that are advancing toward salvation. But when any one shall have arrived there, in him comes to pass that which is written, “perfect love casts out fear.” For they do not fear Him who is now their friend, to whom it is said, “henceforth I will not call you servants, but friends,” when they have been brought through to that which was promised.
10. “O Lord, lead me forth in Your justice because of mine enemies”. He has here sufficiently plainly declared that he is on his onward road, that is, in progress toward perfection, not yet in perfection itself, when he desires eagerly that he may be led forth. But, “in Your justice,” not in that which seems so to men. For to return evil for evil seems justice: but it is not His justice of whom it is said, “He makes His sun to rise on the good and on the evil:” for even when God punishes sinners, He does not inflict His evil on them, but leaves them to their own evil. “Behold,” the Psalmist says, “he travailed with injustice, he has conceived toil, and brought forth iniquity: he has opened a ditch, and dug it, and has fallen into the pit which he wrought: his pains shall be turned on his own head, and his iniquity shall descend on his own pate.” When then God punishes, He punishes as a judge those that transgress the law, not by bringing evil upon them from Himself, but driving them on to that which they have chosen, to fill up the sum of their misery. But man, when he returns evil for evil, does it with an evil will: and on this account is himself first evil, when he would punish evil.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)