Psalms 92:8 - Matthew Poole's English Annotations on the Holy Bible

So this verse is added by way of opposition to the former, They shall perish, but thou shalt endure, as is said in a like comparison, Psalms 102:26; they flourish for a season, but thou rulest for ever to judge and punish them. Or, for (as this Hebrew particle is not seldom used, whereof instances have been formerly given) thou, Lord, art, & c. So this verse gives a reason of the former, as well the first branch of it, why God suffers the wicked to flourish so long, because he is not like man, of short and uncertain continuance here, to whom a little time is long and tedious, who therefore impatiently expects the time of vengeance, and fears lest the offender should escape it; whereas God is unchangeable and everlasting, and therefore long-suffering without any inconvenience, and the longest time of the prosperity of the wicked is but short and inconsiderable in his eyes, a thousand years being in his sight but as yesterday when it is past, Psalms 90:4, and they can never escape out of his hands; as also of the latter branch of the verse, why the wicked shall be destroyed for ever, because God lives and reigns for ever to execute that just sentence of everlasting punishment which he hath pronounced against them.