Whatever be the occasion of the psalm, its course of thought is obvious. There is first a vow of praise in which others are summoned to unite (vv. 1-3); then follows a section in which personal experience and invocation to others are similarly blended (vv. 4-10); and finally a purely didactic section, analysing the practical manifestations of "the fear of the Lord" and enforcing it by the familiar contrast of the blessedness of the righteous and the miserable fate of the ungodly. Throughout we find familiar turns of thought and expression, such as are usual in acrostic psalms.
The glad vow of unbroken praise and undivided trust, which begins the psalm, sounds like the welling over of a heart for recent mercy. It seems easy and natural while the glow of fresh blessings is felt, to "rejoice in the Lord always, and again to say Rejoice." Thankfulness which looks forward to its own cessation, and takes into account the distractions of circumstance and changes of mood which will surely come, is too foreseeing. Whether the vow be kept or no, it is well that it should be made; still better is it that it should be kept, as it may be, even amid distracting circumstances and changing moods. The incense on the altar did not flame throughout the day, but, being fanned into a glow at morning and evening sacrifice, it smouldered with a thread of fragrant smoke continually. It is not only the exigencies of the acrostic which determine the order in ver. 2: "In Jehovah shall my soul boast,"--_in Him_, and not in self or worldly ground, of trust and glorying. The ideal of the devout life, which in moments of exaltation seems capable of realisation, as in clear weather Alpine summits look near enough to be reached in an hour, is unbroken praise and undivided reliance on and joy in Jehovah. But alas--how far above us the peaks are! Still to see them ennobles, and to strive to reach them secures an upward course.
The solitary heart hungers for sympathy in its joy, as in its sorrow; but knows full well that such can only be given by those who have known like bitterness and have learned submission in the same way. We must be purged of self in order to be glad in another's deliverance, and must be pupils in the same school in order to be entitled to take his experience as our encouragement, and to make a chorus to his solo of thanksgiving. The invocation is so natural an expression of the instinctive desire for companionship in praise that one needs not to look for any particular group to whom it is addressed; but if the psalm be David's, the call is not inappropriate in the mouth of the leader of his band of devoted followers.
The second section of the psalm (vv. 4-10) is at first biographical, and then generalises personal experience into broad universal truth. But even in recounting what befell himself, the singer will not eat his morsel alone, but is glad to be able at every turn to feel that he has companions in his happy experience. Vv. 4, 5 are a pair, as are vv. 6, 7, and in each the same fact is narrated first in reference to the single soul, and then in regard to all the servants of Jehovah. "This poor man" is by most of the older expositors taken to be the psalmist, but by the majority of moderns supposed to be an individualising way of saying, "poor men." The former explanation seems to me the more natural, as preserving the parallelism between the two groups of verses. If so, the close correspondence of expression in vv. 4 and 6 is explained, since the same event is subject of both. In both is the psalmist's appeal to Jehovah presented; in the one as "seeking" with anxious eagerness, and in the other as "crying" with the loud call of one in urgent need of immediate rescue. In both, Divine acceptance follows close on the cry, and in both immediately ensues succour. "He delivered me from all my fears," and "saved him out of all his troubles," correspond entirely, though not verbally. In like manner vv. 5 and 7 are alike in extending the blessing of the unit so as to embrace the class. The absence of any expressed subject of the verb in ver. 5 makes the statement more comprehensive, like the French "_on_," or English "they." To "look unto Him" is the same thing as is expressed in the individualising verses by the two phrases, "sought," and "cried unto," only the metaphor is changed into that of silent, wistful directing of beseeching and sad eyes to God. And its issue is beautifully told, in pursuance of the metaphor. Whoever turns his face to Jehovah will receive reflected brightness on his face; as when a mirror is directed sunwards, the dark surface will flash into sudden glory. Weary eyes will gleam. Faces turned to the sun are sure to be radiant.