| Barnes' Notes on the Bible He turneth the wilderness into a standing water - A pool; a lake. See the notes at Isaiah 35:6-7. And dry ground into water-springs - Not merely watering it with rain from heaven, but causing gushing fountains to break forth, and to flow continually, diffusing fertility and beauty everywhere.
Gill's Exposition of the Entire BibleHe 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.''
Geneva Study BibleHe {q} turneth the wilderness into a standing water, and dry ground into watersprings. (q) For the love that he bears to his Church, he changes the order of nature for their convenience.
Wesley's Notes 107:35 Water - Into a well - watered and fruitful land.
Matthew Henry's Concise Commentary107:33-43 What surprising changes are often made in the affairs of men! Let the present desolate state of Judea, and of other countries, explain this. If we look abroad in the world, we see many greatly increase, whose beginning was small. We see many who have thus suddenly risen, as suddenly brought to nothing. Worldly wealth is uncertain; often those who are filled with it, ere they are aware, lose it again. God has many ways of making men poor. The righteous shall rejoice. It shall fully convince all those who deny the Divine Providence. When sinners see how justly God takes away the gifts they have abused, they will not have a word to say. It is of great use to us to be fully assured of God's goodness, and duly affected with it. It is our wisdom to mind our duty, and to refer our comfort to him. A truly wise person will treasure in his heart this delightful psalm. From it, he will fully understand the weakness and wretchedness of man, and the power and loving-kindness of God, not for our merit, but for his mercy's sake. | 
