Psalms 73:18 - Joseph Benson’s Commentary on the Old and New Testaments

Thou didst set them in slippery places Their happiness hath no firm foundation; it is very unstable, like a man's standing on very slippery ground. Thou castedst them down into destruction The same hand which raised them will soon cast them down into utter ruin. “Worldly prosperity,” says Dr. Horne, “is as the narrow and slippery summit of a mountain, on which, to answer the designs of his providence, God permits the wicked, during his pleasure, to take their station; till, at length, the fatal hour arrives, when, by a stroke unseen, they fall from thence, and are lost in the fathomless ocean of sorrow, torment, and despair.”