37 (ש) Mark the perfect, and behold the upright; For there is a posterity to the man of peace. 38 And apostates are destroyed together; The posterity of the wicked is cut off.
39 (ת) And the salvation of the righteous is from Jehovah, Their stronghold in time of trouble. 40 And Jehovah helps them and rescues them; He rescues them from the wicked, and saves them, Because they take refuge in Him.
There is a natural connection between acrostic structure and didactic tone, as is shown in several instances, and especially in this psalm. The structure is on the whole regular, each second verse beginning with the required letter, but here and there the period is curtailed or elongated by one member. Such irregularities do not seem to mark stages in the thought or breaks in the sequence, but are simply reliefs to the monotony of the rhythm, like the shiftings of the place of the pause in blank verse, the management of which makes the difference between a master and a bungler. The psalm grapples with the problem which tried the faith of the Old Testament saints--namely, the apparent absence of correlation of conduct with condition--and solves it by the strong assertion of the brevity of godless prosperity and the certainty that well-doing will lean to well-being. The principle is true absolutely in the long run, but there is no reference in the psalm to the future life. Visible material prosperity is its promise for the righteous, and the opposite its threatening for the godless. No doubt retribution is not wholly postponed till another life, but it does not fall so surely and visibly as this psalm would lead us to expect. The relative imperfection of the Old Testament revelation is reflected in the Psalms, faith's answer to Heaven's word. The clear light of New Testament revelation of the future is wanting, nor could the truest view of the meaning and blessedness of sorrow be adequately and proportionately held before Christ had taught it by His own history and by His words. The Cross was needed before the mystery of righteous suffering could be fully elucidated, and the psalmist's solution is but provisional. His faith that infinite love ruled and that righteousness was always gain, and sin loss, is grandly and eternally true. Nor is it to be forgotten that he lived and sang in an order of things in which the Divine government had promised material blessings as the result of spiritual faithfulness, and that, with whatever anomalies, modest prosperity did, on the whole, attend the true Israelite. The Scripture books which wrestle most profoundly with the standing puzzle of prosperous evil and afflicted goodness are late books, not merely because religious reflectiveness was slowly evolved, but because decaying faith had laid Israel open to many wounds, and the condition of things which accompanied the decline of the ancient order abounded with instances of triumphant wickedness.
But though this psalm does not go to the bottom of its theme, its teaching of the blessedness of absolute trust in God's providence is ever fresh, and fits close to all stages of revelation; and its prophecies of triumph for the afflicted who trust and of confusion to the evil-doer need only to be referred to the end to be completely established. As a theodicy, or vindication of the ways of God with men, it was true for its age, but the New Testament goes beneath it. As an exhortation to patient trust and an exhibition of the sure blessings thereof, it remains what it has been to many generations: the gentle encourager of meek faith and the stay of afflicted hearts.
Marked progress of thought is not to be looked for in an acrostic psalm. In the present instance the same ideas are reiterated with emphatic persistence, but little addition or variation. To the didactic poet "to write the same things is not grievous," for they are his habitual thoughts; and for his scholars "it is safe," for there is no better aid to memory than the cadenced monotony of the same ideas cast into song and slightly varied. But a possible grouping may be suggested by observing that the thought of the "cutting off" of the wicked and the inheritance of the land by the righteous occurs three times. If it is taken as a kind of refrain, we may cast the psalm into four portions, the first three of which close with that double thought. Vv. 1-9 will then form a group, characterised by exhortations to trust and assurances of triumph. The second section will then be vv. 10-22, which, while reiterating the ground tone of the whole, does so with a difference, inasmuch as its main thought is the destruction of the wicked, in contrast with the triumph of the righteous in the preceding verses. A third division will be vv. 23-29, of which the chief feature is the adduction of the psalmist's own experience as authenticating his teaching in regard to the Divine care of the righteous, and that extended to his descendants. The last section (vv. 30-40) gathers up all, reasserts the main thesis, and confirms it by again adducing the psalmist's experience in confirmation of the other half of his assurances, namely the destruction of the wicked. But the poet does not wish to close his words with that gloomy picture, and therefore this last section bends round again to reiterate and strengthen the promises for the righteous, and its last note is one of untroubled trust and joy in experienced deliverance.