Job 28:7

[There is] a path which no fowl knoweth,.... A path made by miners to the gold, silver, brass, and iron ores; to the places where gems and precious stones lie; the way to which was never seen, and could never have been discovered by the most sharp-sighted fowl, as "the eagle" ; which some think is particularly intended; and the Greek word for an eagle seems to be derived from the word used in the text: this fowl, the king of birds, as it is the swiftest, it is the most quick-sighted of any; but, though it is eager, and looks out sharp after its prey, and which it beholds at a great distance, and in the most secret lurking places, and flies unto it, and seizes upon it at once, yet it never could look into the bowels of the earth, or discover a track leading thereunto; in this it is outdone by the diligent and laborious miner, who is not at a loss to make his way into the inmost and darkest recesses of the earth:which the vulture's eye hath not seen; which is next to the eagle, and some of them are of the species of it, and is a very sharp-sighted creature, even to a proverb, as well as voracious, which makes it diligent to search everywhere for its prey; and yet this creature's sharp and piercing eye never saw the path the miners make by digging into the earth, in order to get metals and minerals from it.