3. Their deliverance out of captivity shall be accompanied with a blessed reformation, and they shall return effectually cured of their inclination to idolatry, which will complete their deliverance and make it a mercy indeed. They had defiled their own land with their detestable things, v. 18. But, when they have smarted for so doing, they shall come and humble themselves before God, v. 19-21. (1.) They shall be brought to acknowledge that their God only is God indeed, for he is a God in need—"My strength to support and comfort me, my fortress to protect and shelter me, and my refuge to whom I may flee in the day of affliction." Note, Need drives many to God who had set themselves at a distance from him. Those that slighted him in the day of their prosperity will be glad to flee to him in the day of their affliction. (2.) They shall be quickened to return to him by the conversion of the Gentiles: The Gentiles shall come to thee from the ends of the earth; and therefore shall not we come? Or, "The Jews, who had by their idolatries made themselves as Gentiles (so I rather understand it), shall come to thee by repentance and reformation, shall return to their duty and allegiance, even from the ends of the earth, from all the countries whither they were driven." The prophet comforts himself with the hope of this, and in a transport of joy returns to God the notice he had given him of it: "O Lord! my strength and my fortress, I am now easy, since thou hast given me a prospect of multitudes that shall come to thee from the ends of the earth, both of Jewish converts and of Gentile proselytes." Note, Those that are brought to God themselves cannot but rejoice greatly to see others coming to him, coming back to him. (3.) They shall acknowledge the folly of their ancestors, which it becomes them to do, when they were smarting for the sins of their ancestors: "Surely our fathers have inherited, not the satisfaction they promised themselves and their children, but lies, vanity, and things wherein there is no profit. We are now sensible that our fathers were cheated in their idolatrous worship; it did not prove what it promised, and therefore what have we to do any more with it?" Note, It were well if the disappointment which some have met with in the service of sin, and the pernicious consequences of it to them, might prevail to deter others from treading in their steps. (4.) They shall reason themselves out of their idolatry; and that reformation is likely to be sincere and durable which results from a rational conviction of the gross absurdity there is in sin. They shall argue thus with themselves (and it is well argued), Should a man be such a fool, so perfectly void of the reason of a man, as to make gods to himself, the creatures of his own fancy, the work of his own hands, when they are really no gods? v. 20. Can a man be so besotted, so perfectly lost to human understanding, as to expect any divine blessing or favour from that which pretends to no divinity but what it first received from him? (5.) They shall herein give honour to God, and make it to appear that they know both his hand in his providence and his name in his word, and that they are brought to know his name by what they are made to know of his hand, v. 21. This once, now at length, they shall be made to know that which they would not be brought to know by all the pains the prophets took with them. Note, So stupid are we that nothing less than the mighty hand of divine grace, known experimentally, can make us know rightly the name of God as it is revealed to us.