In "Doctrinal Discussion" Jason Lindahl writes:

One of these was Job, a respected leader in his ancient community. In Eastern poetical language, he said, “Oh that I were as in months past, as in the days when God preserved me . . . when I washed my steps with butter, and the rock poured me out rivers of oil” (29:2-6). Job confessed that he fully expected to die in this blessed state: “Then I said, I shall die in my nest, and I shall multiply my days as the sand” (29:18). However, his story illustrates that wealth, by itself, is a lousy source of security. In chapter 28, Job wrote about the wealth of precious stones and metals hidden in the earth and the means men use to mine them. Perhaps some of his own wealth was related to this mining. However, Job went on to explain that wisdom's value is much greater than all of this earthly wealth. He understood the principle that “the fear of the Lord, that is wisdom; and to depart from evil is understanding” (v. 28). Job's hope was not in his wealth, but in God.

Source: Building Christian Relationships: Adult Teacher's Insights, page 32.