John Calvin Commentary Psalms 92:6

"A brutish man knoweth not; Neither doth a fool understand this:" — Psalms 92:6 (ASV)

The foolish man shall not know them. This is added appropriately, to inform us that the fault lies with ourselves, in not praising the Divine judgments as we should. For although the Psalmist had spoken of them as deep and mysterious, he informs us here that they would be discerned without difficulty, if it were not for our stupidity and indifference.

By the foolish, he means unbelievers in general, implicitly contrasting them with believers who are divinely enlightened by the word and Spirit. The ignorance and blindness to which he alludes possess all without exception whose understandings have not been illuminated by Divine grace. It should be our prayer to God that he would purify our sight and enable us to meditate on his works.

In short, the Psalmist vindicates the incomprehensible wisdom of God from the contempt that proud men have often cast upon it, charging them with folly and madness for such conduct; and he would arouse us from that insensibility, which is too prevalent, to a proper and serious consideration of the mysterious works of God.