Adam Clarke on Psalms 92:7

When the wicked spring as the grass - This is a lesson which is frequently inculcated in the sacred writings. The favor of God towards man is not to be known by outward prosperity; nor is his disapprobation to be known by the adverse circumstances in which any person may be found. When, however, we see the wicked flourish, we may take for granted that their abuse of God's mercies will cause him to cut them off as cumberers of the ground; and, dying in their sins, they are destroyed for ever.