11 Why do I say this? “For mine enemies have spoken against me, and they that were keeping watch for My soul, have taken counsel together: saying, God has forsaken Him, persecute Him, and seize Him, for there is no one to deliver Him”. This has been said concerning Christ. For He that with the great power of Divinity, wherein He is equal to the Father, had raised to life dead persons, on a sudden in the hands of enemies became weak, and as if having no power, was seized. When would He have been seized, except they had first said in their heart, “God has forsaken Him?” Whence there was that voice on the Cross, “My God, My God, why have You forsaken Me?” So then did God forsake Christ, though “God was in Christ reconciling the world to Himself,” though Christ was also God, out of the Jews indeed according to the flesh, “Who is over all things, God blessed for ever,” — did God forsake Him? Far be it. But in our old man our voice it was, because our old man was crucified together with Him: and of that same our old man He had taken a Body, because Mary was of Adam. Therefore the very thing which they thought, from the Cross He said, “Why have You forsaken Me?” Why do these men think Me left alone to their evil? What is, think Me forsaken in their evil? “For if they had known, the Lord of glory they had never crucified. Persecute and seize Him.” More familiarly however, brethren, let us take this of the members of Christ, and acknowledge our own voice in these words: because even He used such words in our person, not in His own power and majesty; but in that which He became for our sakes, not according to that which He was, who has made us.
12. “O Lord, my God, be not far from me”. So it is, and the Lord is not far off at all. For, “The Lord is near unto them that have bruised the heart.” “My God, unto my help look Thou.” “Be they confounded and fail that engage my soul”. What has he desired? “Be they confounded and fail.” Why has he desired it? “That engage my soul”? What is, “That engage my soul”? Engaging as it were unto some quarrel. For they are said to be engaged that are challenged to quarrel. If then so it is, let us beware of men that engage our soul. What is, “That engage our soul”? First provoking us to withstand God, in order that in our evil things God may displease us. For when are you right, so that to you the God of Israel may be good, good to men right in heart? When are you right? Will you hear? When in that good which you do, God is pleasing to you; but in that evil which you suffer God is not displeasing to you. See ye what I have said, brethren, and be ye on your guard against men that engage your souls. For all men that deal with you in order to make you be wearied in sorrows and tribulations, have this aim, namely, that God may be displeasing to you in that which you suffer, and there may go forth from your mouth, “What is this? For what have I done?” Now then have you done nothing of evil, and art you just? He unjust? A sinner I am, you say; I confess, just I call not myself. But what, sinner, have you by any means done so much evil as he with whom it is well? As much as Gaiuseius? I know the evil doings of him, I know the iniquities of him, from which I, though a sinner, am very far; and yet I see him abounding in all good things, and I am suffering so great evil things. I do not then say, O God, “what have I done” to You, because I have done nothing at all of evil; but because I have not done so much as to deserve to suffer these things. Again, art you just, He unjust? Wake up, wretched man, your soul has been engaged! I have not, he says, called myself just. What then do you say? A sinner I am, but I did not commit so great sins, as to deserve to suffer these things. You say not then to God, just I am, and You are unjust: but you say, unjust I am, but You are more unjust. Behold your soul has been engaged, behold now your soul wages war. What? Against whom? Your soul, against God; that which has been made against Him by whom it was made. Even because you are in being to cry out against Him, you are ungrateful. Return, then, to the confession of your sickness, and beg the healing hand of the Physician. Think thou not they are happy who flourish for a time. You are being chastised, they are being spared: perchance for you chastised and amended an inheritance is being kept in reserve....Lastly, see what follows, “Let them put on confusion and shame, that think evil things to me.” “Confusion and shame,” confusion because of a bad conscience, shame because of modesty. Let this befall them, and they will be good....
13. “But I always in You will hope, and will add to all Your praise”. What is this? “I will add to all Your praise,” ought to move us. More perfect will you make the praise of God? Is there anything to be superadded? If already that is all praise, will you add anything? God was praised in all His good deeds, in every creature of His, in the whole establishment of all things, in the government and regulation of ages, in the order of seasons, in the height of Heaven, in the fruitfulness of the regions of earth, in the encircling of the sea, in every excellency of the creature everywhere brought forth, in the sons of men themselves, in the giving of the Law, in delivering His people from the captivity of the Egyptians, and all the rest of His wonderful works: not yet He had been praised for having raised up flesh unto life eternal. Be there then this praise added by the Resurrection of our Lord Jesus Christ: in order that here we may perceive His voice above all past praise: thus it is that we rightly understand this also....
14. “My mouth shall tell out Your righteousness”: not mine. From thence I will add to all Your praise: because even that I am righteous, if righteous I am, is Your righteousness in me, not my own: for You justify the ungodly. “All the day long Your salvation.” What is, “Your salvation”? Let no one assume to himself, that he saves himself, “Of the Lord is Salvation.” Not any one by himself saves himself, “Vain is man's salvation.” “All the day long Your Salvation:” at all times. Something of adversity comes, preach the Salvation of the Lord: something of prosperity comes, preach the Salvation of the Lord. Do not preach in prosperity, and hold your peace in adversity: otherwise there will not be that which has been said, “all the day long.” For all the day long is day together with its own night. Do we when we say, for example, thirty days have gone by, mention the nights also; do we not under the very term days include the nights also? In Genesis what was said? “The evening was made, and the morning was made, one day.” Therefore a whole day is the day together with its own night: for the night does serve the day, not the day the night. Whatever you do in mortal flesh, ought to serve righteousness: whatever you do by the commandment of God, be it not done for the sake of the advantage of the flesh, lest day serve night. Therefore all the day long speak of the praise of God, to wit, in prosperity and in adversity; in prosperity, as though in the day time; in adversity, as though in the night time: all the day long nevertheless speak of the praise of God, so that you may not have sung to no purpose, “I will bless God at every time, always the praise of Him is in my mouth.”...
Source: The Enarrations, or Expositions, on the Psalms (New Advent)