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17. The needy and poor shall seek water. Here he follows out the subject which he had begun to handle at the beginning of the fortieth chapter; for he describes the wretched and afflicted condition in which the Jews should be in Babylon, till at length God should have compassion on them and render assistance. He therefore prepares them for enduring extreme poverty, by saying that they will be thirsty; for this figure of speech, by which a part is taken for the whole, is better adapted to express the severity of the affliction. We know that nothing gives men greater distress than the want of water when they are “thirsty.”

I Jehovah will listen to them. God declares that he will relieve them, when they are brought to this necessitous condition; and hence we ought to learn to whom this promise belongs, namely, to those who, having been reduced to extremity, are as it were, parched with thirst and almost fainting. Hence also we see that the Church does not always possess an abundance of all blessings, but sometimes feels the pressure of great poverty, that she may be driven by these spurs to call upon God; for we commonly fall into slothfulness, when everything moves on according to our wish. It is therefore advantageous to us to thirst and hunger, that we may learn to flee to the Lord with our whole heart. In a word, we need to be deeply affected with a conviction of our poverty, that we may feel the Lord’s assistance. The Prophet unquestionably intended, by this circumstance, partly to illustrate the greatness of the favor, and partly to advise the people not to lose heart on account of their poverty.

The needy and poor. We ought to observe the names by which the Prophet here denominates the people of God. When he calls them “afflicted and poor,” he does not speak of strangers, but of those whom the Lord had adopted and chosen to be his heritage, and whom he forewarns that they must patiently endure some severe hardships. Hence we ought not to wonder if the Lord sometimes permit us almost to languish through hunger and thirst, since he dealt not less severely with our fathers.

When he says that waters are nowhere to be seen, let us learn that the Lord, in order to try our patience and faith, withdraws from us every assistance, that we may lean on him alone. Thus, when we look around on every side, and see no relief, let us know that still the Lord will assist. By the expression, I will listen, he means that God does not assist every kind of persons, but those who pray to him; for if we are so slothful as to disregard his aid, it is right that we should be altogether deprived of it, and, on account of our unworthiness, should feel no alleviation.

18. and 19. I will open rivers. He illustrates the former doctrine in a different manner, namely, that God has no need of outward and natural means for aiding his Church, but has at his command secret, and wonderful methods, by which he can relieve their necessities, contrary to all hope and outward appearance. When no means of relief are seen, we quickly fall into despair, and scarcely venture to entertain any hope, but so far as outward aids are presented to our eyes. Deprived of these, we cannot rest on the Lord. But the Prophet states that at that time especially they ought to trust, because at that time the Lord has more abundant opportunities of displaying his power, when men perceive no ways or methods, and everything appears to be utterly desperate. Contrary, then, to the hope and belief of all men, the Lord will assist his people, that we may not suffer ourselves to be driven hither and thither by doubt and hesitation.

On lofty mountain tops. In order to confirm his statement more fully, he promises that he will perform miracles contrary to the nature and order of things, that we may not imagine that we should think and judge of these things according to human capacity, or limit the power and promises of God to these inferior means. ¹⁴³¹⁴³     “Aux causes secondes.” “To second causes.” The Lord has sufficient power in himself, and needs not to borrow from any other, and is not confined to the order of nature, which he can easily change, whenever he thinks fit; for when he says that he will make waters to flow on the tops of mountains, and fountains in valleys, and pools in deserts, we know that all this is contrary to the order of nature. The reason why he promised these things is abundantly evident. It was that the Jews might not think that they were prevented from returning to Judea by that vast desert in which travelers are scorched by the heat of the sun, and deprived of all the necessaries of life. The Lord therefore promises that he will supply them with water, and with everything else that is necessary for the journey. Now, these things were fulfilled when the Lord brought his people out of Babylon, but much more abundantly when he converted the whole world to himself by Christ the Redeemer, from whom flow in great abundance throughout the whole world waters to quench the thirst of poor sinners. ¹⁴⁴¹⁴⁴     “Des poures pecheurs.” At that time such a change took place as could never have entered into the imaginations of men.

20. Therefore let them see and know. While God leads us by all his works to adore him, yet when the restoration of his Church is the matter in question, his wonderful power is manifested, so as to constrain all to admire him. As we have seen elsewhere, and as he will afterwards repeat frequently, when he brought back his people from banishment, he gave a proof fitted for being remembered in all ages, as he declares in this passage that he will do. But because we are either sluggish or careless in considering his works, and because they quickly pass away from our view in consequence of our giving so little attention to them, he repeats the same statement in many forms. We give our attention to vain and useless matters, instead of admiring these works of God; and if at any time they excite our admiration, yet we quickly forget them, because we are speedily led aside to different and very unimportant matters. The Prophet therefore arouses us, in order to shake off our slothfulness, and to quicken and direct all our senses to understand the power of God. On this account he places in the first rank looking, which produces certain knowledge, and next adds thought, which more fully and abundantly confirms the knowledge.

It is uncertain whether the Prophet speaks of the Jews, who were the citizens of the Church, or of foreigners; but in my opinion we may view it as having a general meaning, that in the restoration of the Church the hand of God will be visible even to very remote Gentiles, so that all shall be constrained to admire the work of God. Yet it is certain that the Persians and Medes, after having conquered the Jews, were singularly astonished when they heard those passages from the prophets, and especially when they beheld the accomplishment of them before their eyes; for they knew that such things could not be performed by men, though they were not converted to God.