Albert Barnes Commentary Job 28:20

"Whence then cometh wisdom? And where is the place of understanding?" — Job 28:20 (ASV)

Whence then cometh wisdom? - This question is now repeated from Job 28:12, in order to give it greater emphasis. It is designed to fix the attention on the inquiry as one which found no solution in the discoveries of science, and whose solution was hidden from the most penetrating human intellect.