John Gill Bible Commentary

He turneth the wilderness into a standing water,.... On the other hand, when it is the pleasure of God, a country uncultivated and like a desert, he makes it fruitful as one that is well watered and tilled; as this country of ours, and the land in America, once waste places, now fruitful ones. And dry ground into water springs: which is expressive of the same thing, and may he figuratively understood of the Gentile world; which, before the coming of Christ, and the preaching of the Gospel, and the pouring down of the Spirit, was like a wilderness and dry ground; but now watered with the word and ordinances, and the grace of God, and in many places has become fruitful in grace and good works. The Targum prefaces this verse thus, "when they return unto the law, he turneth, &c.''