Albert Barnes Commentary Psalms 94:8

"Consider, ye brutish among the people; And ye fools, when will ye be wise?" — Psalms 94:8 (ASV)

Understand, you brutish among the people — See Psalms 73:22. The meaning here is, “You who are like the brutes; you who see and understand no more of the character and plans of God than the wild beasts of the desert.” The meaning is that they did not employ their reason in the case; they acted like beasts, regardless of the consequences of their conduct — as if God would treat people as He does the beasts, as if there were no retribution in the future world.

And you fools, when will you be wise? — How long is this stupidity to continue? When will you attend to the truth? When will you act as immortal beings? When will you allow your rational nature to lead you to just views of God? It is implied that this folly had been manifested for a long period, and that it was time they should arouse themselves from this condition and act like people. How appropriately can this language still be addressed to the great mass of mankind! What numbers of the human race are there now who, in respect to God and to the purpose for which they were made, show no more wisdom than the brutes that perish! Oh, if people were truly wise, what a beautiful world this would be; how noble and elevated our now degraded race would be!