The psalmist has no revelation here of future retribution. His vindication of God's justice is not based on that, but simply on the transiency of worldly prosperity, and on its dangerous character. It is "a slippery place," and it is sure to come to an end. It is obvious that there are many other considerations which have to be taken into account, in order to a complete solution of the problem of the psalm. But the psalmist's solution goes far to lighten the painful perplexity of it; and if we add his succeeding thoughts as to the elements of true blessedness, we have solution enough for peaceful acquiescence, if not for entire understanding. The psalmist's way of finding an answer is even more valuable than the answer which he found. They who dwell in the secret place of the Most High can look on the riddle of this painful world with equanimity, and be content to leave it half unsolved. Vv. 21, 22, are generally taken as one sentence, and translated as by Delitzsch, "If my heart should grow bitter ... I should be brutish," etc.; or, as by Hupfeld, "When my heart grew bitter ... then I was as a beast," etc.; but they are better regarded as the psalmist's penitent explanation of his struggle. "Unbelieving thoughts had fermented in his mind, and a pang of passionate discontent had pierced his inmost being. But the higher self blames the lower self for such folly" (Cheyne, _in loc._). His recognition that his doubts had their source, not in defect in God's providence, but in his own ignorance and hasty irritation, which took offence without cause, prepares him for the sweet, clear note of purely spiritual aspiration and fruition which follows in the next strophe.