4 Thus then do thou say also, “In Him will I trust. For He Himself shall deliver me”, not I myself. Observe whether he teaches anything but this, that all our trust be in God, none in man. Whence shall he deliver you? “From the snare of the hunter, and from a harsh word.” Deliverance from the hunter's net is indeed a great blessing: but how is deliverance from a harsh word so? Many have fallen into the hunter's net through a harsh word. What is it that I say? The devil and his angels spread their snares, as hunters do: and those who walk in Christ tread afar from those snares: for he dares not spread his net in Christ: he sets it on the verge of the way, not in the way. Let then your way be Christ, and you shall not fall into the snares of the devil....
But what is, “from a harsh word”? The devil has entrapped many by a harsh word: for instance, those who profess Christianity among Pagans suffer insult from the heathen: they blush when they hear reproach, and shrinking out of their path in consequence, fall into the hunter's snares. And yet what will a harsh word do to you? Nothing. Can the snares with which the enemy entraps you by means of reproaches, do nothing to you? Nets are usually spread for birds at the end of a hedge, and stones are thrown into the hedge: those stones will not harm the birds. When did any one ever hit a bird by throwing a stone into a hedge? But the bird, frightened at the harmless noise, falls into the nets; and thus men who fear the vain reproaches of their calumniators, and who blush at unprovoked insults, fall into the snares of the hunters, and are taken captive by the devil...Just as among the heathen, the Christian who fears their reproaches falls into the snare of the hunter: so among the Christians, those who endeavour to be more diligent and better than the rest, are doomed to bear insults from Christians themselves. What then does it profit, my brother, if you occasionally find a city in which there is no heathen? No one there insults a man because he is a Christian, for this reason, that there is no Pagan therein: but there are many Christians who lead a bad life, among whom those who are resolved to live righteously, and to be sober among the drunken, and chaste among the unchaste, and amid the consulters of astrologers sincerely to worship God, and to ask after no such things, and among spectators of frivolous shows will go only to church, suffer from those very Christians reproaches, and harsh words, when they address such a one, “You are the mighty, the righteous, you are Elias, you are Peter: you have come from heaven.” They insult him: whichever way he turns, he hears harsh sayings on each side: and if he fears, and abandons the way of Christ, he falls into the snares of the hunters. But what is it, when he hears such words, not to swerve from the way? On hearing them, what comfort has he, which prevents his heeding them, and enables him to enter by the door? Let him say; What words am I called, who am a servant and a sinner? To my Lord Jesus they said, “You have a devil.” You have just heard the harsh words spoken against our Lord: it was not necessary for our Lord to suffer this, but in doing so He has warned you against harsh words, lest you fall into the snares of the hunters.
5. “He shall defend you between His shoulders, and you shall hope under His wings”. He says this, that your protection may not be to you from yourself, that you may not imagine that you can defend yourself; He will defend you, to deliver you from the hunter's snare, and from an harsh word. The expression, “between His shoulders,” may be understood both in front and behind: for the shoulders are about the head; but in the words, “you shall hope under His wings,” it is clear that the protection of the wings of God expanded places you between His shoulders, so that God's wings on this side and that have you in the midst, where you shall not fear lest any one hurt you: only be thou careful never to leave that spot, where no foe dares approach. If the hen defends her chickens beneath her wings; how much more shall you be safe beneath the wings of God, even against the devil and his angels, the powers who fly about in mid air like hawks, to carry off the weak young one? For the comparison of the hen to the very Wisdom of God is not without ground; for Christ Himself, our Lord and Saviour, speaks of Himself as likened to a hen; “how often would I have gathered your children,” etc. That Jerusalem would not: let us be willing....If you consider other birds, brethren, you will find many that hatch their eggs, and keep their young warm: but none that weakens herself in sympathy with her chickens, as the hen does. We see swallows, sparrows, and storks outside their nests, without being able to decide whether they have young or no: but we know the hen to be a mother by the weakness of her voice, and the loosening of her feathers: she changes altogether from love for her chickens: she weakens herself because they are weak. Thus since we were weak, the Wisdom of God made Itself weak, when the Word was made flesh, and dwelt in us, that we might hope under His wings.
6. “His truth shall surround you with a shield”. What are “the wings,” the same is “the shield:” since there are neither wings nor shield. If either were literally, how could the one be the same as the other? Can wings be a shield or a shield wings? But all these expressions, indeed, are figuratively used through likenesses. If Christ were really a Stone, He could not be a Lion; if a Lion, He could not be a Lamb: but He is called both Lion, and Lamb, and Stone, and Calf, and anything else of the sort, metaphorically, because He is neither Stone, nor Lion, nor Lamb, nor Calf, but Jesus Christ, the Saviour of all of us, for these are likenesses, not literal names. “His truth shall be your shield,” it is said: a shield to assure us that He will not confound those whose trust is in themselves with those who hope in God. One is a sinner, and the other a sinner: but suppose one that presumes upon himself is a despiser, confesses not his sins, and he will say, if my sins displeased God, He would not suffer me to live. But another dared not even raise his eyes, but beat upon his breast, saying, “God be merciful to me a sinner.” Both this was a sinner, and that: but the one mocked, the other mourned: the one was a despiser, the other a confessor, of his sins. But the truth of God, which respects not persons, discerns the penitent from him who denies his sin, the humble from the proud, him who presumes upon himself from him who presumes on God. “You shall not be afraid for any terror by night.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)