9 But seeing, brethren, so long as “we are at home in this body, we are absent from the Lord;” and “the corruptible body presses down the soul, and the earthly tabernacle weighs down the mind that muses on many things;” even though we have some way or other dispersed the clouds, by walking as “longing” leads us on, and for a brief while have come within reach of that sound, so that by an effort we may catch something from that “house of God,” yet through the burden, so to speak, of our infirmity, we sink back to our usual level, and relapse to our ordinary state. And just as there we found cause for rejoicing, so here there will not be wanting an occasion for sorrow. For that hart that made “tears” its “bread day and night,” borne along by “longing to the water-brooks” (that is, to the spiritual delights of God), “pouring forth his soul above himself,” that he may attain to what is “above” his own soul, walking towards “the place of the wonderful tabernacle, even unto the house of God,” and led on by the sweetness of that inward spiritual sound to feel contempt for all outward things, and be borne on to things spiritual, is but a mortal man still; is still groaning here, still bearing about the frailty of flesh, still in peril in the midst of the “offenses” of this world. He therefore glances back to himself, as if he were coming from that world; and says to himself, now placed in the midst of these sorrows, comparing these with the things, to see which he had entered in there, and after seeing which he had come forth from thence;
“Why art you cast down, O my soul, and why do you disquiet me?”. Lo, we have just now been gladdened by certain inward delights: with the mind's eye we have been able to behold, though but with a momentary glance, something not susceptible of change: why do you still “disquiet me, why are you” still “cast down”? For you do not doubt of your God. For now you are not without somewhat to say to yourself, in answer to those who say, “Where is your God?” I have now had the perception of something that is unchangeable; why do you disquiet me still?
“Hope in God.” Just as if his soul was silently replying to him, “Why do I disquiet you, but because I am not yet there, where that delight is, to which I was, as it were, rapt for a moment? Am I already 'drinking' from this 'fountain' with nothing to fear?”...Still “Hope in God,” is his answer to the soul that disquiets him, and would fain account for her disquiet from the evils with which this world abounds. In the mean while dwell in hope: for “hope that is seen is not hope; but if we hope for that we see not, then do we with patience wait for it.”
10. “Hope in God.” Why “hope”? “For I will confess unto Him.” What will you “confess”? “My God is the saving health of my countenance.” My “health” (my salvation) cannot be from myself; this it is that I will say, that I will “confess.” It is my God that is “the saving health of my countenance.” For to account for his fears, in the midst of those things, which he now knows, having come after a sort to the “understanding” of them, he has been looking behind him again in anxiety, lest the enemy be stealing upon him: he cannot yet say, “I am made whole every whit.” For having but “the first-fruits of the Spirit, we groan within ourselves; waiting for the adoption, to wit, the redemption of the body.” When that “health” (that salvation) is perfected in us, then shall we be living in the house of God for ever, and praising for ever Him to whom it was said, “Blessed are they that dwell in Your house, they will be praising You world without end.” This is not so yet, because the salvation which is promised, is not as yet in being; but it is “in hope” that I confess unto God, and say, “My God is the saving health of my countenance.” For it is “in hope” that “we are saved; but hope that is seen, is not hope.”...
11. “My soul is disquieted on account of myself”. Is it disquieted on account of God? It is on my own account it is disquieted. By the Unchangeable it was revived; it is by the changeable it is disquieted. I know that the righteousness of God remains; whether my own will remain steadfast, I know not. For I am alarmed by the Apostle's saying, “Let him that thinks he stands, take heed lest he fall.” Therefore since “there is no soundness in me for myself,” there is no hope either for me of myself. “My soul is disquieted on account of myself.”...“Therefore I remember You, O Lord, from the land of Jordan, and from the little hill of Hermon.” From whence did I remember you? From the “little hill,” and from the “land of Jordan.” Perhaps from Baptism, where the remission of sins is given. For no one runs to the remission of sins, except he who is dissatisfied with himself; no one runs to the remission of sins, but he who confesses himself a sinner; no one confesses himself a sinner, except by humbling himself before God. Therefore it is from “the land of Jordan I have remembered you, and from the hill;” observe, not “of the great hill,” that you may make of the “little hill” a great one: for “whoso exalts himself shall be abased, and whoso humbles himself shall be exalted.” If you would also ask the meanings of the names, Jordan means “their descent.” Descend then, that you may be “lifted up:” be not lifted up, lest you be cast down. “And the little hill of Hermon.” Hermon means “anathematizing.” Anathematize yourself, by being displeased with yourself; for if you are pleased with yourself, God will be displeased with you. Because then God gives us all good things, because He Himself is good, not because we are worthy of it; because He is merciful, not because we have in anything deserved it; it is from “the land of Jordan, and from Hermon,” that I remember you. And because he so remembers with humility, he shall earn his exaltation to fruition, for he is not “exalted” in himself, who “glories in the Lord.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)