Psalms 77:8

Doth - To do; to produce; make.

For evermore? - לדר ודר ledor vador, "to generation and generation." From race to race. Shall no mercy be shown even to the remotest generation of the children of the offenders?

Is his mercy clean gone for ever? - The word rendered "clean gone" means to fail; to fail utterly. The idea is, Can it be that the compassion of God has become exhausted - that no more mercy is to be shown to mankind - that henceforth all is to be left to stern and severe justice? What would the world be if this were so! What must be the condition of mankind if mercy were no more to be shown to the race!

Doth his promise fail for evermore? - Margin, as in Hebrew, "to generation and generation." The original Hebrew rendered "promise" means "word;" and the question is, whether it can be that what God has spoken is to be found false. Can we no longer rely on what he has said? All the hopes of mankind depend on that, and if that should fail, all prospect of salvation in regard to our race must be at an end.