Surely thou didst set them up in slippery places. The wicked have at no time any sure hold on their prosperity. They are a "set in slippery places"—places from which they may easily slip and fall. Thou castedst them down to destruction.
The fall often comes, even in this life. The flourishing cities of the plain are destroyed by fire from heaven; Pharaoh's land is ruined by the plagues, and his host destroyed in the Red Sea; Sennacherib's army perishes in a night; Jezebel is devoured by dogs; Athaliah is slain with the sword; Antiochus Epiphanes perishes in a distant expedition; Herod Agrippa is eaton of worms; persecutors, like Nero, Galerius, Julian, come to untimely ends.
A signal retribution visits the wicked in hundreds and thousands of instances. When it does not, the question remains—Is death the end? This point is not formally brought forward, but it underlies the whole argument; and, unless retribution after death be regarded as certain, a single exception to the general rule of retribution in this life would upset the solution which the psalmist finds satisfactory.