1 In my distress I cried unto the LORD, and he heard me. 2 Deliver my soul, O LORD, from lying lips, and from a deceitful tongue. 3 What shall be given unto thee? or what shall be done unto thee, thou false tongue? 4 Sharp arrows of the mighty, with coals of juniper. 5 Woe is me, that I sojourn in Mesech, that I dwell in the tents of Kedar! 6 My soul hath long dwelt with him that hateth peace. 7 I am for peace: but when I speak, they are for war.
[AD 373] Athanasius of Alexandria on Psalms 120:1-2
Therefore it was none other than God whom David too implored for his deliverance: “When I was in trouble, I called on the Lord, and he heard me; deliver my soul, O Lord, from lying lips and from a deceitful tongue.” To him also giving thanks he spoke the words of the song in the seventeenth psalm [LXX], in the day in which the Lord delivered him from the hand of all his enemies and from the hand of Saul, saying, “I will love you, O Lord, my strength; the Lord is my strong rock and my defense and deliverer.” And Paul, after enduring many persecutions, to none other than God gave thanks, saying, “Out of them all the Lord delivered me; and he, in whom we trust, will deliver me.”

[AD 430] Augustine of Hippo on Psalms 120:1
When therefore a man has commenced thus to order his ascent; to speak more plainly, when a Christian has begun to think of spiritual amendment, he begins to suffer the tongues of adversaries. Whoever has not yet suffered from them, has not yet made progress; whoever suffers them not, does not even endeavour to improve. Does he wish to know what we mean? Let him at the same time experience what is reported of us. Let him begin to improve, let him begin to wish to ascend, to wish to despise earthly, fragile, temporal objects, to hold worldly happiness for nothing, to think of God alone, not to rejoice in gain, not to pine at losses, to wish even to sell all his substance, and distribute it among the poor, and to follow Christ; let us see how he suffers the tongues of detractors and of constant opponents, and— a still greater peril— of pretended counsellors, who lead him astray from salvation...He then, who will ascend, first of all prays God against these very tongues: for he says, "When I was in trouble, I called on the Lord; and He heard me" [Psalm 120:1]. Why did He hear him? That He might now place him at the steps of ascent.

[AD 430] Augustine of Hippo on Psalms 120:2
"Deliver my soul, O Lord, from unrighteous lips, and from a deceitful tongue" [Psalm 120:2]. What is a deceitful tongue? A treacherous tongue, one that has the semblance of counsel, and the bane of real mischief. Such are those who say, And will you do this, that nobody does? Will you be the only Christian?...Some deter by dissuasion, others discourage yet more by their praise. For since such is the life that has for some time been diffused over the world, so great is the authority of Christ, that not even a pagan ventures to blame Christ. He who cannot be censured is read. They cannot contradict Christ, they cannot contradict the Gospel, Christ cannot be censured; the deceitful tongue turns itself to praise as an hindrance. If you praise, exhort. Why do you discourage with your praise?...You turn yourself to another mode of dissuasion, that by false praise you may turn me away from true praise; nay, that by praising Christ you may keep me away from Christ, saying, What is this? Behold these men have done this: thou, perhaps, will not be able: you begin to ascend, you fall. It seems to warn you: it is the serpent, it is the deceitful tongue, it has poison. Pray against it, if you wish to ascend.

[AD 430] Augustine of Hippo on Psalms 120:3-4
And your Lord says unto you, "What shall be given you, or what shall be set before you, against the deceitful tongue?" [Psalm 120:3]. What shall be given you, that is, as a weapon to oppose to the deceitful tongue, to guard yourself against the deceitful tongue? "Or what shall be set before you?" He asks to try you: for He will answer His own question. For He answers following up his own inquiry, "even sharp arrows of the Mighty One, with coals that desolate, or that lay waste" [Psalm 120:4]. They that desolate, or that lay waste (for it is variously written in different copies), are the same, because by laying waste, as you may observe, they easily lead unto desolation. What are these coals? First, beloved brethren, understand what are arrows. The "sharp arrows of the Mighty One," are the words of God...What then are the "coals that lay waste?" It is not enough to plead with words against a deceitful tongue and unrighteous lips: it is not enough to plead with words; we must plead with examples also...The word coals, then, is used to express the examples of many sinners converted to the Lord. Thou hear men wonder, and say, I knew that man, how addicted he was to drinking, what a villain, what a lover of the circus, or of the amphitheatre, what a cheat: now how he serves God, how innocent he has become! Wonder not; he is a live coal. You rejoice that he is alive, whom you were mourning as dead. But when you praise the living, if you know how to praise, apply him to the dead, that he may be inflamed; whosoever is still slow to follow God, apply to him the coal which was extinguished, and have the arrow of God's word, and the coal that lays waste, that you may meet the deceitful tongue and the lying lips.

[AD 420] Jerome on Psalms 120:5-6
But why should that be hard to bear which we must one day ourselves endure? And why do we grieve for the dead? We are not born to live forever. Abraham, Moses and Isaiah, Peter, James and John, Paul, the “chosen vessel,” and even the Son of God have all died; and are we vexed when a soul leaves its earthly tenement? Perhaps he is taken away, “lest wickedness should alter his understanding … for his soul pleased the Lord; therefore he hastened to take him away from the people”5—lest in life’s long journey he should lose his way in some trackless maze. We should indeed mourn for the dead, but only for one whom Gehenna receives, whom Tartarus7 devours and for whose punishment the eternal fire burns. But we who, in departing, are accompanied by an escort of angels and met by Christ, should rather grieve that we have to tarry yet longer in this tabernacle of death. For “while we are at home in the body, we are absent from the Lord.” Our one longing should be that expressed by the psalmist: “Woe is me that my pilgrimage is prolonged, that I have dwelled with them who dwell in Kedar, that my soul has made a far pilgrimage.” Kedar means darkness, and darkness stands for this present world (for, we are told, “the light shines in darkness; and the darkness comprehends it not”). Therefore we should congratulate our dear Blaesilla, that she has passed from darkness to light, and has in the first flush of her dawning faith received the crown of her completed work. Had she been cut off (as I pray that none may be) while her thoughts were full of worldly desires and passing pleasures, then mourning would indeed have been her due, and no tears shed for her would have been too many. As it is, by the mercy of Christ she, four months ago, renewed her baptism in her vow of widowhood, and for the rest of her days spurned the world and thought only of the religious life.

[AD 430] Augustine of Hippo on Psalms 120:5
"Alas, that my sojourning has become far off!" [Psalm 120:5]. It has departed far from You: my pilgrimage has become a far one. I have not yet reached that country, where I shall live with no wicked person; I have not yet reached that company of Angels, where I shall not fear offenses. But why am I not as yet there? Because sojourning is pilgrimage. He is called a sojourner who dwells in a foreign land, not in his own country. And when is it far off? Sometimes, my brethren, when a man goes abroad, he lives among better persons, than he would perhaps live with in his own country: but it is not thus, when we go afar from that heavenly Jerusalem. For a man changes his country, and this foreign sojourn is sometimes good for him; in travelling he finds faithful friends, whom he could not find in his own country. He had enemies, so that he was driven from his country; and when he travelled, he found what he had not in his country. Such is not that country Jerusalem, where all are good: whoever travels away from thence, is among the evil; nor can he depart from the wicked, save when he shall return to the company of Angels, so as to be where he was before he travelled. There all are righteous and holy, who enjoy the word of God without reading, without letters: for what is written to us through pages, they perceive there through the Face of God. What a country! A great country indeed, and wretched are the wanderers from that country.

[AD 430] Augustine of Hippo on Psalms 120:6
"My soul has wandered much" [Psalm 120:6]. Lest you should understand bodily wandering, he has said that the soul wandered. The body wanders in places, the soul wanders in its affections. If you love the earth, you wander from God: if you love God, you rise unto God. Let us be exercised in the love of God, and of our neighbour, that we may return unto charity. If we fall towards the earth, we wither and decay. But one descended unto this one who had fallen, in order that he might arise. Speaking of the time of his wandering, he said that he wandered in the tents of Kedar. Wherefore? Because "my soul has wandered much." He wanders there where he ascends. He wanders not in the body, he rises not in the body. But wherein does he ascend? "The ascent," he says, "is in the heart."

[AD 430] Augustine of Hippo on Psalms 120:7
"With them that hated peace, I was peaceful" [Psalm 120:7]. But howsoever ye may hear, most beloved brethren, you will not be able to prove how truly ye sing, unless you have begun to do that which you sing. How much soever I say this, in whatsoever ways I may expound it, in whatsoever words I may turn it, it enters not into the heart of him in whom its operation is not. Begin to act, and see what we speak. Then tears flow forth at each word, then the Psalm is sung, and the heart does what is sung in the Psalm...Who are they who hate peace? They who tear asunder unity. For had they not hated peace, they would have abode in unity. But they separated themselves, forsooth on this account, that they might be righteous, that they might not have the ungodly mixed with them. These words are either ours or theirs: decide whose. The Catholic Church says, Unity must not be lost, the Church of God must not be cut off. God will judge afterwards of the wicked and the good...This we also say: Love ye peace, love ye Christ. For if they love peace, they love Christ. When therefore we say, Love ye peace, we say this, Love ye Christ. Wherefore? For the Apostle says of Christ, "He is our peace, who has made both one." [Ephesians 2:14] If Christ is therefore peace, because He has made both one: why have ye made two of one? How then are you peace-makers, if, when Christ makes one of two, you make two of one? But since we say these things, we are peace-makers with them that hate peace; and yet they who hate peace, when we spoke to them, made war on us for nought.