28:15 It cannot be gotten for {k} gold, neither shall silver be weighed [for] the price thereof.

(k) It can neither be bought for gold nor precious stones, but is only the gift of God.

28:12-19 Job here speaks of wisdom and understanding, the knowing and enjoying of God and ourselves. Its worth is infinitely more than all the riches in this world. It is a gift of the Holy Ghost which cannot be bought with money. Let that which is most precious in God's account, be so in ours. Job asks after it as one that truly desired to find it, and despaired of finding it any where but in God; any way but by Divine revelation.